Chapter 35337*P35.60(a)As the mirror turns through angle θ, the angle of incidenceincreases by θand so does the angle of reflection. The incident rayis stationary, so the reflected ray turns through angle 2θ. Theangular speed of the reflected ray is 2ωm. The speed of the dot oflight on the circular wall is 2ωmR.(b)The two angles marked θin the figure to the right are equalbecause their sides are perpendicular, right side to right side andleft side to left side.We havecosθ=+=dxddsdx22anddsdtxdm=+222ω.Sodxdtdsdtxddxddm=+=+22222ω.FIG. P35.60P35.61(a)For polystyrene surrounded by air, internal reflection requires
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Total internal reflection, 30.3°, 26.8°, 1.49 K, 42.2°