Reversibility of rays. Ray 1 of light in medium a (see Figure 23.51) strikes the surface at 51.0° with respect to the normal, (a) Find the angle of refraction of ray 1 with respect to the normal in medium b. (b) Now repeat the problem with the light ray’s direction reversed. The ray now approaches from below at the angle than you calculated in part (a). Find the angle of refraction in medium a. (c) Do the refraction angles change when tl ray is reversed?
Figure 23.51
Problem 38
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