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Critical angle is given by

n=1/sinC

sinC= 1/n n=4/3

sin C= 3/4

C = sin inverse(3/4)

C= 48.5 degresss

n=1/sinC

sinC= 1/n n=4/3

sin C= 3/4

C = sin inverse(3/4)

C= 48.5 degresss

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Critical angle is possible when light rays pass from glass into air. Hence according to the law of refraction we have: