Reflection and Refraction of Light26122.57Refer to the figure given at the right. ()( )1243minδαεθ=+= − + −abcbcdNote that triangles and are congruent. Therefore, βγ=23and their complementary angles are also equal, or 1sinn=. From Snell’s law at point a, 2sin=(1) and at point d, sinsinn=Since =, comparison of these results shows that 41=, so ( )2min=−. But, ( )29090902Aθβ=°−=, or
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