If the critical angle for total internal reflection from a medium to vacuum is 30o. Then velocity of light in the medium is:
3×108m/s
2.5×108m/s
4.5×108m/s
1.5×108m/s
A
3×108m/s
B
1.5×108m/s
C
2.5×108m/s
D
4.5×108m/s
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Solution
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Critical angle for total internal reflection θc=30o
As we know, refractive index of air medium nair=1
Refractive index of the medium n=1sinθc
∴n=1sin30o=10.5
⟹n=2
Velocity of light in medium v=cn
∴v=3×1082=1.5×108m/s
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