Reflection and Refraction of Light25122.38The critical angle for this material in air is 111.00sinsin47.31.36aircpipennθ−−===90.042.7rc°Thus, =°−and from Snell’s law, ( )1.36 sin42.7sin67.21.00°==sinsinpiperiairnn=°22.39The light must be totally reflecting from the surface of a hot air layer just above the road surface. The angle of reflection, and hence the critical angle, is 90.01.2088.8c=°−°=°. Thus, from 21sincnn=(, we find )21sin1.000 3 sin88.81.000 08cnn°=22.40The circular raft must cover the area of the surface through which light from the diamond could emerge. Thus, it must form the base of a cone (with apex at the
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