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Question: If velocity of light in air is 3 × 0<sup>8</sup> m/s and that in water is 2 × 10<sup>8</sup> m/s, th...

If velocity of light in air is 3 × 08 m/s and that in water is 2 × 108 m/s, then what would be the critical angle –

A

sin–1 (3/2)

B

tan–1 (3/2)

C

tan–1 (2/3)

D

sin–1 (2/3)

Answer

sin–1 (2/3)

Explanation

Solution

sin ic = = = 23\frac { 2 } { 3 }

\ ic = sin–1 (2/3)