Question

019 What is total internal reflection Velocity of light in a liquid is 1.5x 10 m/s and in air is
3x10 m/s. if a ray of light passes from the liquid to the air find the critical angle
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Answer 1

velocity in medium/velocity in vacuum =critical angle

=> 1.5*10/3*10 = $

=>0.5 = 5/10= 1/2 = sin 30°

hope it helps