That the ray will reflect once from each mirror and that its final direction wil
ID: 1553145 • Letter: T
Question
That the ray will reflect once from each mirror and that its final direction will be opposite to its original direction. The Apollo II astronauts placed a panel of comer cube reflectors on the Moon. Analysis of timing data taken with the panel reveals that the radius of the Moon's orbit is increasing at the rate of 3.8 cm/yr as it loses kinetic energy because of tidal friction. How many times will the incident beam shown in Figure P25.3 be reflected by each of the parallel mirrors? A narrow beam of sodium yellow light, with wavelength 589 nm in vacuum, is incident from air onto a smooth water surface at an angle of incidence of 35.0 degree. Determine the angle of refraction and the wavelength of the light in water. Compare This problem with Problem 25.4. A plane sound wave in air at 20 degree C, with wavelength 589 mm. is incident on a smooth surface of water at 25 degree C, at an angle of incidence of 3.50 degree. Determine the angle of refraction for the sound wave and the wavelength of the sound in water. The wavelength of red helium-neon laser light in air is 632.8 nm. (a) What is its frequency? (b) What is its wavelength in glass that has an index of refraction of 1.50?(c) What is its speed in the glass? An underwater scuba diver sees the Sun at an apparent angle of 45.0 degree above the horizon. What is the actual elevationExplanation / Answer
3) d = h = 1 m
Each time the light bounces once, it has moved upward by an amount = d*tan 5.
If the light bounces off n times, it has moved upward by n, which needs to be greater to or equal than h = 1 m.
Thus, n = h ====> n = h/ = h/(d*tan 5) = 1/(1*tan5) = 11.43 ====> 12 bounces are required.
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