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996_Physics ProblemsTechnical Physics

996_Physics ProblemsTechnical Physics - Chapter 35*P35.60(a...

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Chapter 35 337 *P35.60 (a) As the mirror turns through angle θ , the angle of incidence increases by θ and so does the angle of reflection. The incident ray is stationary, so the reflected ray turns through angle 2 θ . The angular speed of the reflected ray is 2 ω m . The speed of the dot of light on the circular wall is 2 ω m R . (b) The two angles marked θ in the figure to the right are equal because their sides are perpendicular, right side to right side and left side to left side. We have cos θ = + = d x d ds dx 2 2 and ds dt x d m = + 2 2 2 ω . So dx dt ds dt x d d x d d m = + = + 2 2 2 2 2 ω . FIG. P35.60 P35.61 (a) For polystyrene surrounded by air , internal reflection requires
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