334 The Nature of Light and the Laws of Geometric OpticsP35.51(a)We see the Sun moving from east to west across the sky. Its angular speed isωθπ===×−∆∆t2727 105rad86 400 srad s..The direction of sunlight crossing the cell from the window changes at this rate, moving onthe opposite wall at speedvr×=×=−−2 377 27 101 72 100 17254....m radsmsmmsafej.(b)The mirror folds into the cell the motion that would occur in a room twice as wide:=2 0 1740 345mm smm sbg.(c), (d) As the Sun moves southward and upward at 50.0°, we may regard the corner of the windowas fixed, and both patches of light move northward and downward at 50.0°.*P35.52(a)45 0.°as shown in the first figure to the right.(b)YesIf grazing angle is halved, the number of reflections fromthe side faces is doubled.FIG. P35.52P35.53Horizontal light rays from the setting Sun passabove the hiker. The light rays are twice refracted
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