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/sb) 1.5 x 108 m/sc) 6 x 108 m/sd) 13 x 108 m/s

If the critical angle for total internal reflection from a medium to v

1.	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/sb) 1.5 x 108 m/sc) 6 x 108 m/sd) 13 x 108 m/s
Answer» is GIVEN in the pic.And don't FORGET to SOLVE my QUESTION.

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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/sb) 1.5 x 108 m/sc) 6 x 108 m/sd) 13 x 108 m/s​

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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/sb) 1.5 x 108 m/sc) 6 x 108 m/sd) 13 x 108 m/s