A light wave enters from I medium into II medium. Its velocity in second medium is double that in I medium. For the phenomenon of total internal reflection to take place the angle of incidence must be greater than a certain value. This value is
A
20o
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B
30o
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C
45o
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D
60o
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Solution
The correct option is B30o Since velocity of light wave is inversely proportional to refractive index of medium. So the refractive index of second medium is half of the medium 1.
η1=2η2
For total internal reflection the incident rays from denser medium should be