326CHAPTER 24 24.48The polarizing angle for light in air striking a water surface is 11211.333tantan53.11.00pnnθ−−=== °This is the angle of incidence for the incoming sunlight (that is, the angle between the incident light and the normal to the surface). The altitude of the Sun is the angle between the incident light and the water surface. Thus, the altitude of the Sun is 90.090.053.136.9pαθ=°−−°= °24.49The polarizing angle is 211.65tantan58.81.00pnn=°When the light is incident at the polarizing angle, the angle of refraction is 90.0rpθθ−90.058.831.224.50The critical angle for total reflection is ( )121sincnn−=. Thus, if 34.4cas light attempts to go from sapphire into air, the index of refraction of sapphire is 211.001.77sin
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