A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is -
Text Solution
Verified by ExpertsThe correct answer is:
B
sin i = 
= 
, tan i = 
= 
r = 3 m so diameter = 6 m
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