Narrow, parallel, glowing gas-filled tubes in a variety of colors form block letters to spell out the name of a nightclub. Adjacent tubes are all 2.80 cm apart. The tubes forming one letter are filled with neon and radiate predominantly red light with a wavelength of 640 nm. For another letter, the tubes emit predominantly blue light at 440 nm. The pupil of a dark-adapted viewer’s eye is 5.20 mm in diameter. (a) Which color is easier to resolve? State how you decide. (b) If she is in a certain range of distances away, the viewer can resolve the separate tubes of one color but not the other. The viewer’s distance must be in what range for her to resolve the tubes of only one of these two colors?
Narrow, parallel, glowing gas-filled tubes in a variety of colors form block letters to spell out the name of a nightclub. Adjacent tubes are all 2.80 cm apart. The tubes forming one letter are filled with neon and radiate predominantly red light with a wavelength of 640 nm. For another letter, the tubes emit predominantly blue light at 440 nm. The pupil of a dark-adapted viewer’s eye is 5.20 mm in diameter. (a) Which color is easier to resolve? State how you decide. (b) If she is in a certain range of distances away, the viewer can resolve the separate tubes of one color but not the other. The viewer’s distance must be in what range for her to resolve the tubes of only one of these two colors?
Solution Summary: The author explains the formula of Rayleigh's criterion for overlap of two dots separated center to center by 2.00mm.
Narrow, parallel, glowing gas-filled tubes in a variety of colors form block letters to spell out the name of a nightclub. Adjacent tubes are all 2.80 cm apart. The tubes forming one letter are filled with neon and radiate predominantly red light with a wavelength of 640 nm. For another letter, the tubes emit predominantly blue light at 440 nm. The pupil of a dark-adapted viewer’s eye is 5.20 mm in diameter. (a) Which color is easier to resolve? State how you decide. (b) If she is in a certain range of distances away, the viewer can resolve the separate tubes of one color but not the other. The viewer’s distance must be in what range for her to resolve the tubes of only one of these two colors?
A beam of light is incident at 30° on a piece of glass in
air. The dispersion of colors spans 1 mm on the bottom
surface of the glass. The thickness of the glass slab is l =
10 cm. The index of refraction for red light is nred =
1.513. Given nviolet > nred· Determine the index of
refraction for violet light.
30
1 mm
1.546
O 1.587
1.563
1.553
1.572
O 1.591
10 mW of light is incident on a piece of GaAs which is 0.2mm thick. The incident light is a mixture of 5mW at λ1=1.553μm and 5mW at λ2=0.828μm. A total of 7mW mixed light exits out of the GaAs. Assume no reflections at the air/GaAs interface and any light generated by recombination won’t exit the GaAs. What are the absorption coefficients, α, for two different wavelengths?
According to the Young-Helmholtz theory of color vision, humans have cell
receptors called "cones" in their retina that have peak sensitivities in the Red, Green
and Blue wavelength ranges.
When light reflects off a surface, we perceive the color or colors that are
reflected; other colors are absorbed by the material.
Which TWO of the following statements are correct?
Because leaves on a plant reflect green light when illuminated by
white light, other colors are absorbed and are therefore necessary
for photosynthesis.
If a yellow light illuminates a white book, the reflection will cause
the red and green cones of an observer to be stimulated and will
send a signal to the brain by way of the optic nerve.
If both a red light and a green light illuminate a white book, the
reflection will cause the blue cones of an observer to be
stimulated and will send a signal to the brain by way of the optic
nerve.
Because leaves on a plant reflect green light when illuminated by
white light, the green…
Chapter 38 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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