A small source of light is 4 
below the surface of water of refractive index 5/3. In order to cut off all the light, coming out of water surface, minimum diameter of the disc placed on the surface ofwater is
A
6 
B
C
3 
D
4 
.
.
Text Solution
Verified by ExpertsThe correct answer is:
A
: In order to cut offall the light coming out of water surface, angle C should be equal to critical angle.
i . e . 
Now, 
;
Diameter of disc 
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