# The laws of reflection or refraction are the same for sound as for light. The index of refraction of a medium (for sound) is defind as the ratio of th

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The laws of reflection or refraction are the same for sound as for light. The index of refraction of a medium (for sound) is defind as the ratio of the speed of sound in air 343 m//s to the speed of sound in the medium.
What is the index of refraction (for sound) of water (v=1498 m//s)?
What is the critical angle theta, for total reflection of sound from water?

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(a) mu=343/1498=0.229
(b) theta_C=sin^-1(0.229)=13.2^@