20091228 — Hello, some help with math here. How do I figure approx how wide a beam of light I will get from and LED with a certain optic at a specific ...

What isreflection

Light is needed to see things around us, and how well we see them depends on the amount of light and the color of an object.  Unfortunately, most objects don’t produce their own light, so almost everything we see is reflecting light.  The reflected light travels to the retina of our eyes, where an image is received and sent to the brain.

LED backlight is the most popular backlighting for small and medium LCDs. The advantages of LED backlighting are its low cost, long life, immunity to vibration.

Reflection, refraction diffraction

When you look in a mirror, you see your reflection.  This happens because light reflects off of you, hits the mirror, and then reflects off the mirror to your eye.  Reflection occurs when a light wave strikes an object and bounces off it.  When light is reflected from a flat mirror, the incoming ray of light is called the incidence ray.  The law of reflection states that the angle of incidence (i), or where light strikes a surface, is equal to the angle of reflection (r).  Regular reflection occurs when light waves are reflected on a smooth surface, such as a shiny car. Diffuse reflection occurs on a rough surface, such as a brick wall.

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Diffusereflection

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Objects must reflect light to be seen.  Something opaque does not allow light to pass through.  It only absorbs and reflects light.  If something is translucent, some light passes through.  The frosted glass reflects some sunlight and also lets some light pass through.  As a result, light is scattered in different directions.  A transparent item transmits almost all light, absorbing and reflecting only a little bit.  For example, a glass of water is transparent because most light passes through it.

Specularreflection

The document discusses the ability of different materials to block, absorb, or transmit light. It defines opaque materials as those that do not allow light to pass through, transparent materials as those that light can pass through without being absorbed or scattered, and translucent materials as those that allow some light to pass through while scattering or absorbing some of it. Examples of each type of material are given such as paper being opaque and window panes being transparent.Read less

Total internalreflection

A wide range of freshwater fish, amphibians, and reptiles use vitamin A2 to red-shift their visual system.

A prism separates light into colors because of refraction.  The amount of bending depends on the wavelength of the light.  Colors always appear in the same order: red, orange, yellow, green, blue, indigo, and violet.  Light refracted through air layers of different densities can result in mirages.

We carry ultraviolet light bulbs using all of these wavelengths for a variety of stage/studio, special effects, phototherapy, and air/water purification ...

A light meter is a crucial piece of equipment for the photographer to accurately measure the light falling on a subject or reflecting off a subject.

Dialight light pipes are engineered optical components that transmit light from LEDs to the front panel of electrical devices. They offer superior light ...

Refraction oflight

Infrared radiation is emitted by any object that has a temperature (ie radiates heat). So, basically all celestial objects emit some infrared. The wavelength at ...

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Refraction of light occurs when waves of light pass from one medium to another, and the light wave is bent or refracted.  Light travels slower through water than air.  When light hits the water at an angle, the slowing down makes it bend as it changes its direction.  The index of refraction indicates how much a material reduces the speed of light; the more the light is slowed, the greater the index of refraction.