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Q.

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is

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a

3×108m/s

b

1.5×108m/s

c

6×108m/s

d

3×108m/s

answer is B.

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Detailed Solution

μ=1sin⁡C=1sin⁡30=2 ∴v=3×1082=1.5×108m/s
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