23.63.Set Up:The polarizing angle is given by When Solve:givesandandReflect:The critical angle and the polarizing angle both depend on the ratio of the refractive indexes of the twomaterials.23.64.Set Up:The reflected beam is completely polarized when with Solve: (a) gives (b)with gives and Note that23.65.Set Up:The reflected beam is completely polarized whenwithis measured relative to the normal to the surface.Solve: (a) and The sunlight is incident at an angle of above the horizontal.(b)Figure 23.38 in Section 23.10 shows that the plane of the electric field vector in the reflected light is horizontal.Reflect:To reduce the glare (intensity of reflected light), sunglasses with polarizing filters should have the filter axisvertical.23.66.Set Up:At the earth the power radiated by the sun is spread over an area ofwhere is the distance from the earth to the sun. Solve: (a) (b)23.67.Set Up:The wave speed in air is For a totally absorbing surface the radiation pressure is Solve: (a) (b)(c)(d)Reflect:
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