Test Academy | Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°. 2 x 10⁸ m/s, 1.5 x 10⁸ m/s, 0.75 x 10⁸ m/s, 3 x 10⁸ m/s

Question

Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°.

Options :

2 x 10⁸ m/s
1.5 x 10⁸ m/s
0.75 x 10⁸ m/s
3 x 10⁸ m/s

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