•8 In Fig. 35-33, two light pulsesare sent through layers of plasticPulseппwith thicknesses of either L or 2Las shown and indexes of refractionPulsen = 1.55, nz = 1.70, nz = 1.60, n4 = i1.45, ng = 1.59, ng = 1.65, and n, =1.50. (a) Which pulse travelsthrough the plastic in less time?(b) What multiple of Lic gives the difference in the traversaltimes of the pulses?%3DFigure 35-33 Problem 8.

Answered: •8 In Fig. 35-33, two light pulses are…

College Physics

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Chapter25: Geometric Optics

Section: Chapter Questions

Problem 33PE: A ray of 610 nm light goes from air into fused quartz at an incident angle of 55.0°. At what...

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Is it possible that total internal reflection plays a role in rainbows? Explain in terms of indices of refraction and angles, perhaps referring to Figure 25.48. Some of us have seen the formation of a double rainbow. Is it physically possible to observe a triple rainbow? Figure 25.48 Double rainbows are not a very common observance. (credit: InvictusOU812, Flickr)
Calculate the angle of refraction at the air/core interface. • nair = 1, ncore = 1.47, ncladding = 1.45,  incident = 30o
Red light of wavelength 650 nm strikes the side of the-prism (nred = 1.613) șhown in Fig. 19.17 at an incident angle of 53.8°. (a) Calculate the refracted angle relațive to a line perpendicular to the first air-glass interface. (b) If the prism has three 60° angles, calculate the incident angle at the second glass-air interface. (c) Calculate the refracted anglé relative to a line perpendic-lar to this surface. (d) Calculate the net angular change in direction of the light.
A piece of material, suspected of being a stolendiamond (n=2.42)is submerged in oil of refractive index1.43 and illuminated by unpolarized light. It is found thatthe reflected light is completely polarized at an angle of 62°.Is it diamond? Explain
Can a light ray traveling in air be totally reflected when itstrikes a smooth water surface if the incident angle is chosencorrectly? Explain.
A very narrow beam of light containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 0.68 m thick flat block of crown glass and back to air again. The beam strikes at a 30.0º incident angle. By what distance (in mm) perpendicular to their direction of travel are the red and blue beams separated when they emerge? The index of refraction for λ = 660 nm is 1.512 and the index of refraction for λ = 470 nm is 1.524. Enter a number with 3 digits behind the decimal point.
A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer of brine. Bothliquids are clear and do not mix. Point O is at the bottom of the tank, on a vertical axis.The indices of refraction of the oil and the brine are 1.40 and 1.52, respectively. A rayoriginating at O crosses the brine-oil interface at a point 0.60 m from the axis. The raycontinues and emerges into the air above the oil. What is the angle that the ray in the air makes with the vertical?
In the H. G. Wellsnovel The Invisible Man, a personbecomes invisible by altering hisindex of refraction to match thatof air. This is the idea behind thedisappearing eyedropper in Conceptual Question 10. If the invisibleman could actually do this, wouldhe be able to see? Explain
In Section 9.6, we described how the speed of light varies with wavelength (or frequency) for transparent solids. But the speed of light in matter is also a function of temperature and pressure. This dependence is most marked for gases and is instrumental in producing such things as mirages and atmospheric refraction, the latter phenomenon being the displacement of an astronomical object (like the Sun or another star) from its true position because of the passage of its light through the atmosphere. Because Earth’s atmosphere is a gaseous mixture and easily compressed, its density is highest near Earth’s surface and gradually declines with altitude. (Refer to the discussion in Section 4.4 and Figure 4.29.) Thus, the speed of light in the atmosphere is lowest near the surface and gradually gets higher, approaching c as one goes farther and farther into space. Using this fact and the law of refraction, sketch the path a light ray from the Sun would follow upon entering Earth’s atmosphere, and predict the apparent position of the Sun relative to its true position (Figure 9.85). What does this tell you about the actual location of the Sun’s disk relative to your local horizon when you see it apparently setting brilliantly in the west in the evening?
Referring to the electric room heater considered in the first example in this section, calculate the intensity of IR radiation in W/m2 projected by the concave mirror on a person 3.00 m away. Assume that the healing element radiates 1500 W and has an area of 100 cm2, and that half of the radiated power is reflected and focused by the mirror.
A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him?
While using a Michelson interferometer (shown in Fig. 37.13), you see a dark circle at the center of the interference pattern, (i) As you gradually move the light source toward the central mirror M0, through a distance /2, what do you see? (a) There is no change in the pattern, (b) The dark circle changes into a bright circle. (c) The dark circle changes into a bright circle and then back into a dark circle. (d) The dark circle changes into a bright circle, then into a dark circle, and then into a bright circle. (ii) As you gradually move the moving mirror toward the central mirror M0, through a distance /2, what tit) you see? Choose from the same possibilities.

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