Question

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the
medium is
[ ]
a) 3 x 108 m/s
b) 1.5 x 108 m/s
c) 6 x 108 m/s
d) 13 x 108 m/s​

Answer 1

Answer is given in the pic.

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