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Calculate the velocity of the light ray in the medium, if the | NEET EXAM PDF

Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°.
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14%
2 x 108 m/s
57%
1.5 x 108 m/s
18%
0.75 x 108 m/s
10%
3 x 108 m/s