The laser beam is aligned with the outside diameter of the case. This means that you can use the outside of the case for centering and positioning the beam. Our 58 series are made of solid brass.

2: A beam of white light goes from air into water at an incident angle of 75.0 degrees. At what angles are the red (660 nm) and violet (410 nm) parts of the light refracted?

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This is the perfect tool for projecting a point of reference for an exact measurement. It’s used in industrial and commercial applications including manufacturing and assembly operations. Add a line generator lens system and the L/GL58 becomes the standard alignment system for process control Machines which are aligned accurately will suffer less wear and tear and increase productivity and profitability of the company.

Any type of wave can exhibit dispersion. Sound waves, all types of electromagnetic waves, and water waves can be dispersed according to wavelength. Dispersion occurs whenever the speed of propagation depends on wavelength, thus separating and spreading out various wavelengths. Dispersion may require special circumstances and can result in spectacular displays such as in the production of a rainbow. This is also true for sound, since all frequencies ordinarily travel at the same speed. If you listen to sound through a long tube, such as a vacuum cleaner hose, you can easily hear it is dispersed by interaction with the tube. Dispersion, in fact, can reveal a great deal about what the wave has encountered that disperses its wavelengths. The dispersion of electromagnetic radiation from outer space, for example, has revealed much about what exists between the stars—the so-called empty space.

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1: (a) What is the ratio of the speed of red light to violet light in diamond, based on Table 2? (b) What is this ratio in polystyrene? (c) Which is more dispersive?

8: A narrow beam of white light enters a prism made of crown glass at a 45.0o incident angle, as shown below in Figure 7. At what angles, θRed and θViolet do the red (660 nm) and violet (410 nm) components of the light emerge from the prism?

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Douglas College Physics 1207 Copyright © August 22, 2016 by OpenStax is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

Dispersion may produce beautiful rainbows, but it can cause problems in optical systems. White light used to transmit messages in a fiber is dispersed, spreading out in time and eventually overlapping with other messages. Since a laser produces a nearly pure wavelength, its light experiences little dispersion, an advantage over white light for transmission of information. In contrast, dispersion of electromagnetic waves coming to us from outer space can be used to determine the amount of matter they pass through. As with many phenomena, dispersion can be useful or a nuisance, depending on the situation and our human goals.

7: A narrow beam of light containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 1.00 cm thick flat piece of crown glass and back to air again. The beam strikes at a 30.0o incident angle. (a) At what angles do the two colours emerge? (b) By what distance are the red and blue separated when they emerge?

Refraction is responsible for dispersion in rainbows and many other situations. The angle of refraction depends on the index of refraction, as we saw in Chapter 25.3 The Law of Refraction. We know that the index of refraction n depends on the medium. But for a given medium, n also depends on wavelength. (See Table 2. Note that, for a given medium, n increases as wavelength decreases and is greatest for violet light. Thus violet light is bent more than red light, as shown for a prism in Figure 3(b), and the light is dispersed into the same sequence of wavelengths as seen in Figure 1 and Figure 2.

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Everyone enjoys the spectacle of a rainbow glimmering against a dark stormy sky. How does sunlight falling on clear drops of rain get broken into the rainbow of colors we see? The same process causes white light to be broken into colors by a clear glass prism or a diamond. (See Figure 1.)

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5: A parallel beam of light containing orange (610 nm) and violet (410 nm) wavelengths goes from fused quartz to water, striking the surface between them at a 60.0o incident angle. What is the angle between the two colours in water?

Example: To lengthen a laser line, shorten the radius of the cylindrical lens (grind the glass so that the curve is more sharp). This will make the line spread (diverge) faster. To shorten a laser line, decrease the size (cross section) of the laser beam. The smaller the laser beam, the less the beam will interact (hit) the more curved part (the outer edges) of the cylindrical lens. In other words, a small laser beam goes through the middle of the lens and isn’t changed (refracted) much. The reverse is true for large laser beams and longer radius (less curved) cylindrical lens.

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Improper equipment geometry can result in the loss of production time. Our 58 Series Alignment Lasers are used to align, aim, and position parts amd machinery to instantly and accurately measure X-Y deviation at any point along the line up to 300 feet long.

110VAC Operation – No wiring required.  Mounting Bracket Included – Easy Installation, Bright 635nm Laser Beam – Draw dots or lines. Economy Priced – Easy on the wallet! This is a great laser for contruction layouts, measuring, industrial aiming, positioning, marking.

The cylindrical lens types used with the L58 Laser Dot Generator decrease their radius proportionally as the line lengthens. The laser beam size is not changed. This is a simple but effective design approach for industrial customers.

How does a lens form an image? See how light rays are refracted by a lens. Watch how the image changes when you adjust the focal length of the lens, move the object, move the lens, or move the screen.

Controlling the evaluation of optical surface quality. Optical surface quality refers to surface imperfections, such as scratches, digs, sleeks and crush marks, ...

Rainbows are produced by a combination of refraction and reflection. You may have noticed that you see a rainbow only when you look away from the sun. Light enters a drop of water and is reflected from the back of the drop, as shown in Figure 4. The light is refracted both as it enters and as it leaves the drop. Since the index of refraction of water varies with wavelength, the light is dispersed, and a rainbow is observed, as shown in Figure 5 (a). (There is no dispersion caused by reflection at the back surface, since the law of reflection does not depend on wavelength.) The actual rainbow of colors seen by an observer depends on the myriad of rays being refracted and reflected toward the observer’s eyes from numerous drops of water. The effect is most spectacular when the background is dark, as in stormy weather, but can also be observed in waterfalls and lawn sprinklers. The arc of a rainbow comes from the need to be looking at a specific angle relative to the direction of the sun, as illustrated in Figure 5 (b). (If there are two reflections of light within the water drop, another “secondary” rainbow is produced. This rare event produces an arc that lies above the primary rainbow arc—see Figure 5 (c).)

The "mechanical" parts of the lamp are 3D printed, the electronic part is simple and the plastic optical fiber is eye catching. The shape of the lamp is ...

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Improper equipment geometry can result in the loss of production time. Our 58 Series Alignment Lasers are used to align, aim, and position parts and machinery to instantly and accurately measure X-Y deviation at any point along the line up to 300 feet long.

6: A ray of 610 nm light goes from air into fused quartz at an incident angle of 55.0o. At what incident angle must 470 nm light enter flint glass to have the same angle of refraction?

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4: (a) A narrow beam of light containing yellow (580 nm) and green (550 nm) wavelengths goes from polystyrene to air, striking the surface at a 30.0o incident angle. What is the angle between the colours when they emerge? (b) How far would they have to travel to be separated by 1.00 mm?

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We see about six colors in a rainbow—red, orange, yellow, green, blue, and violet; sometimes indigo is listed, too. Those colors are associated with different wavelengths of light, as shown in Figure 2. When our eye receives pure-wavelength light, we tend to see only one of the six colors, depending on wavelength. The thousands of other hues we can sense in other situations are our eye’s response to various mixtures of wavelengths. White light, in particular, is a fairly uniform mixture of all visible wavelengths. Sunlight, considered to be white, actually appears to be a bit yellow because of its mixture of wavelengths, but it does contain all visible wavelengths. The sequence of colors in rainbows is the same sequence as the colors plotted versus wavelength in Figure 2. What this implies is that white light is spread out according to wavelength in a rainbow. Dispersion is defined as the spreading of white light into its full spectrum of wavelengths. More technically, dispersion occurs whenever there is a process that changes the direction of light in a manner that depends on wavelength. Dispersion, as a general phenomenon, can occur for any type of wave and always involves wavelength-dependent processes.

A cylindrical lens is a round bar or cross section of glass through which the collimated laser light passes and then spreads into a fan beam to form a line. The line length is determined by two factors: