A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of the liquid. The minimum radius of disc needed so that light is not coming out is
A
B
3 m
C
6 m
D
4 m
Text Solution
Verified by ExpertsThe correct answer is:
B
Here, 
, For total internal reflection,
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