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If the critical angle for total internal reflecting from medium to vacuum is 30, the velocity of light n the medium is -

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Question

If the critical angle for total internal reflecting from medium to vacuum is 30, the velocity of light n the medium is

Options

  • 3 × 108m/s

  • 1.5 × 10–8m/s

  • 6 × 108m/s

  • `sqrt(3)` × 108m/s

MCQ

Solution

1.5 × 10–8m/s

Explanation:

`mu = C/2 = 1/sinc = 1/(sin 30) = 1/1` = 2

V = `C/2 = (3 xx 10^8)/2` = 1.5 × 10–8 ms–1

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