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Question

If the critical angle for total internal reflection from a medium to vacuum is 30o. Then velocity of light in the medium is:
  1. 3×108 m/s
  2. 2.5×108 m/s
  3. 4.5×108 m/s
  4. 1.5×108 m/s

A
3×108 m/s
B
1.5×108 m/s
C
2.5×108 m/s
D
4.5×108 m/s
Solution
Verified by Toppr

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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