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Combination of Thin Lenses in Contact comes under the topic of Optics in the JEE Syllabus. This topic forms about 10% of the entire JEE syllabus and every year about 2-3 questions are asked from this particular topic. The chances of the question being asked from the combination of thin lenses in contact is quite high because of the variety of problems that can be framed from this topic. So, this topic should be practised a lot and concepts should be understood thoroughly.

• HS Diploma or GED equivalent required • 2-year Electro-Mechanical degree preferred • 3-5 years of applicable experience in a manufacturing environment required • Experience with screen-printing presses & oven lines as well as light fabrication equipment such as steel rule die presses, laminators, lasers preferred

LED edge-lit backlighting typically costs less than LED array backlighting. This is because it requires fewer LEDs. And with fewer LEDs, devices with edge-lit backlighting cost less than those with LED array backlighting.

• High school degree, GED, or equivalent. • 3-5 years of maintenance in a manufacturing job shop environment. • Previous electrical and mechanical background required – hands-on experience in schematic and electrical, diagrams / illustrations. • An AA degree in mechanical, electrical, or industrial maintenance a plus but not required.

• High school diploma or equivalent a must • 1-2 years’ work experience working in a manufacturing facility • 1-2 years’ experience working with printing a plus

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The lens's form dictates whether it causes light rays to converge or diverge, and the substance used could be a piece of glass or plastic. Since the lens material has a different index of refraction than the surrounding air, the actual bending of light rays caused by a lens happens because of this. Snell's law of refraction, which connects the difference in angle between the incident and refracted light rays to the indices of refraction for the two materials, describes this behaviour.

• Exposure to contaminants or hazardous conditions with inks and chemicals. • Personal Protective Equipment includes safety glasses, gloves and lab jackets. • Majority of position is standing. • Time Pressure. • Importance of being exact or accurate.

• Perform in-process inspection during printing operation • Assist press operator, including clean-up – keeping press downtime to a minimum • Operate all color computer equipment in the department

• High school diploma or equivalent a must • 1-2 years’ work experience working in a manufacturing facility • 1-2 years’ experience working with printing a plus

Also known as LED full-array backlighting, it allows for consistent brightness. Since the LEDs are spread evenly in intersecting rows and columns, they are able to illuminate the entire device without creating bright or dark spots.

• Perform inspections on incoming material or to release products to shipping • Process documentation such as test results, inspections, travelers, etc., and creating/moving the documentation on the network for transmittal to the customer • Provide support in quality related functions such as CARs, CAPAs, SCARs, and investigating customer returns (RMAs) • Perform and generate accurate First Article inspection reports in accordance with customer prints and specifications • Prepare customer required documentation & certificates (CofCs) • Perform other duties as needed or assigned

The Plant Maintenance Tech has complete responsibility and accountability for building, grounds & equipment maintenance.

The focal length of a lens or mirror refers to the separation between its convex or concave surface and its focal point. It is the location where two parallel light beams collide or merge. The focal length of a convex mirror is positive, whereas the focal length of a concave mirror is negative.

Main Job Responsibilities / Functions: Summary: Service our customers as a member of our Printing team. Focus on Digital Printing of graphics running our HP5600 Indigo Digital Press.

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• 2 – 3 years of formulating inks for the printing industry on plastics, aluminum or rigid substrates preferred. • Working with back lit color formulations. • Familiarity in using different types of color measurement tools. • Proficient in Excel and Word.

Similarly, a double concave lens is surrounded by two inwardly curved spherical surfaces. The margins are thicker than the centre. Light beams are diverted by such lenses. Diverging lenses are what these are known as. Concave lens is the common name for a double concave lens.

Light-emitting diode (LED) has become synonymous with backlighting. It’s one of the most popular backlighting technologies for keypads, switches, TVs, computer monitors and other devices.

Now, we know that the power of a lens is the reciprocal of its focal length. So, the power of the combination will be the sum of the individual powers of the lenses. If we consider the power of first lens to be P1 and the power of the second lens to be P2, then the power of the combination will be,

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• Near Vision or ability to see details at close range • Visual Color Discrimination or ability to match or detect differences between colors, including shades of color and brightness • Deductive Reasoning or ability to apply general rules to specific problems to produce answers that make sense • Problem Sensitivity or ability to recognized there is a problem • Strong organizational and prioritization skills • Communication with Supervisors, Peers or Subordinates by phone, email or in person • Mechanical • Self – motivated, customer focused (external & internal customers) • Team player as well as being able to work independently • Accountable and able to make sound judgement and decisions

LEDs are semiconductors that generate light in response to an electrical current. As electricity flows through an LED, it will illuminate. This illumination will shine through the device with which the LED is used. While all LEDs act as light-producing semiconductors, some of them are arranged differently than others. There’s LED array backlighting, for instance, and there’s LED edge-lit backlighting.

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• Scheduling and managing workflow. • Communication – ability to effectively present information and respond to questions frommanagers, customers, and employees. • Strong attention to detail. • Organizational and prioritization. • Active Listening – Giving full attention to what other people are saying, taking time tounderstand the points being made, asking questions as appropriate, and not interrupting at inappropriate times. • Service Orientation – Actively looking for ways to help people. • Ability to manage multiple projects at one time and be flexible to meet changing requirements. • Problem solving skills to accurately define, analyze, break down, and solve complex problems. • Ability to work independently. • Customer friendly attitude.

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Similarly, for the lens N, the object which is the image formed at I1 is at a distance of v1 from the lens and the final image which is formed at I is at a distance v from it. Again, using the lens formula, we can write

Now, we’ll be looking at a combination of thin lenses in contact. A combination of lenses is also known as compound lens. In contrast to compound lens systems, which allow the employment of many lenses along a single common axis, simple lens systems only employ one lens. Two thin lenses kept in touch with one another make up the simplest of these compound lens systems.

Now if we notice carefully, from the above equation we can replace the term $\dfrac{1}{f_{1}}+\dfrac{1}{f_{2}}=\dfrac{1}{F}$

Secondary Duties And Responsibilities: • Assist Manufacturing Engineer with equipment builds & new process development • Maintain database for PM records • Assist in continuous improvement projects • Other duties and responsibilities as assigned

• Experience with digital and or screen printing, Acrobat, InDesign, Microsoft Office, AutoCAD, RIP software, EPICOR, Corel Draw (not a requisite but a plus) • Comprehensive knowledge Adobe Illustrator – CC preferred • Experience with Excel & Word • Understanding of the manufacturing process & needs of other departments, including Prepress experience • Understand Positive vs Negative film and the difference between first and second surface printing • Ability to manipulate and create own graphics for processes • Understanding of proper documentation and traceability • Ability to read and understand Job Traveler, Art Traveler, and ISO Procedure Manual • Receive files electronically & maintain operating system • Review Jobs for correct processes & information • Generate files for fabrication – laser, turret, steel rule die, Datron • Navigate EPICOR to verify process information, material, job location and part history

An alternative LED backlighting technology is edge lit. LED edge-lit backlighting still involves the use of light-producing semiconductors that, when exposed to electricity, illuminate the respective device. LED edge-lit backlighting simply uses a different arrangement for these LEDs.

• Manages Preventive Maintenance system for building & equipment • Accountable for building & equipment repairs including contracting & scheduling outside services • Coordinates and participates in equipment installs or moves including contracting & scheduling outside services

• Positive attitude & influence • Ability to clearly communicate verbally and in writing • Highly organized and consistent • Excels with minimal supervision, self-directed • Ability to quickly adapt to change, cooperate with, and elicit cooperation from others • Must be able to work under pressure and remain flexible, with good work attendance • Commitment to quality and the quality improvement process

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• Entering and confirming orders. • Following up with customers via email, phone or mail. • Inform customers of estimated delivery schedules, service contracts, warranties, or otherinformation pertaining to purchased products. • Work closely with production and shipping managing customer shipments and expedites. • Entering quotes for engineering to complete. • Handling Customer Complaints / RMA’s and investigation. • Completing open order reports and other various excel spreadsheets. • Compile Job Travelers. • Tracking and controlling sales orders. • Sending samples to customers. • Cold calling customer leads. • Potential customer visits to evaluate needs or to promote product or service sales. • Other tasks as assigned by Inside Sales Supervisor

• No color deficiencies. • Ability to read blueprints. • Analytical and problem-solving skills. • Dexterity and Arm-Hand Steadiness – ability to quickly move hands, arms, fingers to grasp, manipulate or assemble and the ability to keep hand and arm steady. • Superb organization and prioritization. • Coordination – adjusting actions in relation to others’ actions. • Operation and Control – controlling operations of equipment or systems. • Excellent physical condition and able to lift up to 50 lbs. • Ability to stand for long periods of time. • Some computer knowledge. • Good mechanical, math and reading abilities.

• Exposure to contaminants or hazardous conditions with inks and chemicals. • Personal Protective Equipment includes safety glasses, gloves and lab jackets. • 100% standing position. • Time pressure.

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• Good eye for small detailed inspection • Able to sit or stand for long periods of time • Good organizational skills • Good basic math skills and be able to use a ruler • Some computer background

We can also say that a lens is created by a transparent material that is bound by two surfaces, either of which is spherical. This indicates that at least one spherical surface confines a lens. The other surface would be planar if there were only one spherical surface. There are two types of lenses depending on the type of spherical surface used, it could either be bulging outwards or converging inwards. The two types of lenses are convex and concave lenses. We’ll see this in more detail.

Suppose we have two lenses, M and N, with f1 and f2 focal lengths, respectively. S is some object positioned on the common principal axis. The first lens M produces an image at I1. This image at I1 becomes the object of the second lens N. The final image is created at I as we can see from the diagram below. This system of lenses is known as a combination of lenses.

Accurately follow work instructions for generating artwork • Sending art proofs to customers • Generating production files for screen printing and fabrication • Prepare files for outsourced parts (ETCH) per work instructions • Preflight and troubleshoot customer digital files, load fonts, inspect graphics, and make color separations (4 color process and spot colors), familiar with traps and bleeds • Output files to image setter; set line screens, resolution, and other press-specific settings • Prepare files for output to film & digital devices • Create / edit work instructions as required • Maintain inventory & order supplies for graphic department • Operate and assist in maintenance of graphics prepress equipment • Occasionally working with buyers to discuss prints and graphics • Other duties and responsibilities as assigned

The word “lens” comes from the Latin word for “lentil,” owing to the similarity in shape between the converging lens and the legume. A lens is a transparent piece of material that has been formed to bend light rays in a particular direction as they pass through it, whether that means having the rays converge at a particular point or diverge as if from a particular point.

• Printing operation on plastics, aluminum or rigid substrates a plus but not a requisite. • Machine operation a plus but not a requisite.

• High school degree, GED, or equivalent. • Additional Graphic Arts education a plus. • Color matching accuracy. • Numerical accuracy. • Organizational skills a must. • Visual color discrimination. • Ability to lift up to 75 lbs. • Ability to stand for long periods of time. • Mathematical skills a must, able to equate decimals and percentages. • Be able to use a ruler and caliper. • Analytical and problem solving. • No color deficiencies. • Ability to read blueprints. • An understanding of various industry color measurement instruments and ink rheology’s. • Superb organization and prioritization. • Creative thinker – ability to develop, design, or create new applications, ideas relationships, systems or products, including artistic contributions. • Ability to analyze and interpret technical information and procedures. • Team player – work with supervisors, co-workers, and subordinates in person, over the phone or via email.

• Set up, feed and operate screen presses efficiently referencing blueprints and job jackets, while maintaining high quality and performance standards. • Check for ink coverage and density, alignment and registration. • Production related trouble shooting. • Inspect printed materials or other images to verify quality. • Collect samples of materials or products for testing. • Clean-up of equipment at job completion. • Successfully cross train into other areas of the department, including prepress. • Completing all documentation for production requirements. • Maintain clean working area. • Perform other duties as assigned.

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• High school degree, GED, or equivalent. • Additional Graphic Arts education a plus. • Excellent physical condition and able to lift up to 50 lbs. • Ability to stand for long periods of time. • Good mechanical, math and reading abilities. • Be able to use a rule and caliper. • Analytical and problem-solving skills. • Good eye for small detail inspection & no color deficiencies. • Ability to read blueprints. • Dexterity and Arm-Hand Steadiness – ability to quickly move hands, arms, fingers to grasp, manipulate or assemble and the ability to keep hand and arm steady. • Superb organization and prioritization. • Coordination – adjusting actions in relation to others’ actions. • Operation and Control – controlling operations of equipment or systems. • Some computer knowledge. • Quality Conscious • Team Player.

LED array backlighting is a backlighting technology that involves the use of light-producing semiconductor LEDs across the entire screen or interface. The LEDs are placed in a grid-like pattern behind the top panel.

• Good eye for small detail. • Ambitious, energetic, quality conscience. • Driven and results oriented. • Self-directed multi-tasker and works well under pressure. • Professional approach. • Team player – work with supervisors, co-workers, and subordinates in person.

LED backlighting technologies are often classified according to the way in which the LEDs are arranged. LED array backlighting is characterized by a grid-like arrangement involving both rows and columns of LEDs. LED edge-lit backlighting, on the other hand, is characterized by a perimeter of LEDs. With LED edge-lit backlighting, the LEDs are only placed along the edges of the device.

• Printing operation on plastics, aluminum or rigid substrates preferred, not required. • Machine operation preferred, not required.

• Mixing and preparation of inks for production (two shifts). • Accurate documentation of formula files. • Examine job orders to determine quantities, stock specification, colors or special printing instructions. • Verify the substrate and ink meet the specifications for a given job. • Color matching. • Monitor inventory levels on a regular basis, ordering or requesting additional supplies, as necessary. • R & D – Developing new ink applications. • Perform other duties as assigned.

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• Exposure to contaminants or hazardous conditions with inks and chemicals. • Personal Protective Equipment includes safety glasses, gloves, lab jackets, hearing protection, hard hats, and steel toed boots. • Loud noise levels and exposure to hot and cold temperatures. • Outdoor work activities and weather exposure; including snow removal and roof work. • Majority of position is standing. • Time Pressure. • Importance of being exact or accurate. • Ability to lift up to 50 lbs. of product. • Must have a valid driver’s license.

LED array backlighting, though, offers a more even and consistent level of brightness. The LEDs will illuminate the device without creating bright or dark spots. The end result is a more even and consistent level of brightness.

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This means that the combination of lenses is replaced by a single lens having a focal length F and it forms the image at I when the object is placed at S. F is the focal length of the combination of lenses.

Another advantage of LED edge-lit backlighting is energy efficiency. Devices with LED edge-lit backlighting consume less energy than their array counterparts. All LEDs consume energy. LED edge-lit backlighting uses fewer LEDs than LED array backlighting, resulting in increased energy efficiency.

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With LED edge-lit backlighting, the LEDs are arranged on the edges of the device. They aren’t arranged in a grid-like pattern. Instead, the LEDs are arranged exclusively along the edges or perimeter of the device.

• Set-up & operate the digital printer producing graphic overlays • Set-up & operate screen printing press for back-up colors or textures • Check for ink coverage and density, alignment and registration • Production related trouble shooting

• High school degree, GED or equivalent • Additional Graphic Arts education a plus (Adobe Illustrator) • Digital printing experience a plus

Responsible for performing installations and repairs (motors, starters, fuses, electrical power to machine etc.) for industrial equipment and machines in order to support the achievement of Nelson-Miller’s business goals and objectives:

• Proven team player who likes to get hands dirty • Results oriented ready to take ownership of maintenance function • Self-directed, multi-tasker • Passionate about housekeeping • Great analytical and problem-solving skills • Superb organization and prioritization skills

$\begin{align}&\left(\dfrac{1}{v_{1}}-\dfrac{1}{u}\right)+\left(\dfrac{1}{v}-\dfrac{1}{v_{1}}\right)=\dfrac{1}{f_{1}}+\dfrac{1}{f_{2}} \\ &\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f_{1}}+\dfrac{1}{f_{2}} \end{align}$

Qualifications • Able to work independently with good analytical & problem-solving skills • Good eye for small detail & color deficiencies • Superb mechanical, math & reading abilities • Quality focus • Strong organization & prioritization skills

• High School Diploma • Graphics Degree or Art related Degree • Degree in electronics prepress or two years on the job experience

• High school degree, GED, or equivalent required. Post high-school education preferred. • 2-3 years’ experience in an administrative, Customer Service and/or Inside Sales role. • Reading mechanical and electrical blueprints. • ERP / MRP system knowledge. • Strong computer skills including Excel, Power Point and Word Proficiency (Microsoft Office). • Manufacturing job shop exposure preferred, not required.

• Strong mechanical aptitude. • Time Management – superior organizational and prioritization skills. • Problem solving aptitude by accurately defining, analyzing, breaking down, and solving complex problems. • Strong math skills needed. • Flexibility to meet changing requirements under challenging conditions. • Outstanding written and verbal communication skills. • Ability to work independently. • Proven team player. • Quick learner. • Driving desire for personal and organizational improvement. • Strong attention to detail and quality conscious. • Desire to own decisions and take responsibility for outcomes.

• Printing operation on plastics, aluminum or rigid substrates preferred, not required. • Machine operation preferred, not required.

• Ability to read and interpret prints, drawing, schematics • Knowledge of electronics (PLC’s), pneumatics, hydraulics • Familiar with HVAC systems and air compressors

We just considered two lenses, but if we had n lenses having focal lengths f1, f2,f3,.....fn respectively then the focal length of their combination would be

From the diagram, we can see that the object distance from first lens M is u and the image formed by the first lens is at I1 which is at distance v1 from it. So using the lens formula we can write,

• High School diploma or GED • Background in electronics a plus • Must be competent with Microsoft Word, Excel, and Outlook • Ability to analyze discrepant products to determine root cause, identify and implement corrective actions • Using basic inspection tools (calipers, micrometers, multimeters, optical comparators) • ISO 9001 Quality System • Interpreting engineering drawings, customer prints & electronic schematics/pinouts • Working in an Enterprise Resource Planning (ERP) system, Epicor a plus

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A lens is a piece of glass with two spherical borders and a finite thickness. We refer to a lens as being thin if its thickness is significantly less than its diameter. Two types of thin lenses can be found, which are the convex and concave lenses. Thin lenses find many uses. They are utilised in magnifying glasses, cameras, refracting telescopes, binoculars, eyeglasses, contact lenses, and microscopes. The most important applications of thin lenses are in the eye, the telescope and the microscope.

• Perform highly diversified duties to install and maintain electrical apparatus on production machines and any other facility equipment (Screen Print, Punch Press, Steel Rule Die, Automated Machines, Turret, Laser Cutting Machines, etc.). • Provide electrical emergency/unscheduled diagnostics, repairs of production equipment during production and performs scheduled electrical maintenance repairs of production equipment during machine service. • Perform regular electrical preventative maintenance on machines, equipment, and plant facilities. • Read and interpret electrical manuals and work orders to perform required electrical maintenance and service. • Use a variety of hand and power tolls, code, diagrams and testing in performing duties. • Follow all projects through from start to finish while maintaining safe maintenance principles. • Comply with safety regulations and maintain clean and orderly work areas. • Forklift operation. • Other duties and responsibilities assigned.

It's possible for a lens to have two spherical surfaces that protrude. A double convex lens is the name for such a lens. It is referred to as a convex lens. Compared to the edges, the centre is thicker. Light rays converge through a convex lens. Thus, converging lenses refer to convex lenses.

Lenses are created by a transparent material that is bound by two surfaces, either of which is spherical. There can be two types of surfaces, one that’s bulging outwards and one that’s bending inwards. This makes two lenses which are the convex and concave lenses. Concave lens is called diverging lens and convex lens is known as converging lens. The equivalent focal length F of two lenses kept in contact having focal lengths f1 and f2 is