Adisc is placed on asurface ofpond which has refractive index 5/3. Asource oflight is placed 4 
below the surface of liquid. The minimum radius of disc needed so that light is not coming out is,
A
B
3 m
C
6m
D
4m
Text Solution
Verified by ExpertsThe correct answer is:
B
: 
is the critical angle.
or, 
or, 
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