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 liquid. The minimum radius of disc needed so that light is not coming out is, (b) 3 m (c) 6 m (d) 4 m
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 liquid. The minimum radius of disc needed so that light is not coming out is, (b) 3 m (c) 6 m (d) 4 m
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Transcribed Image Text: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 liquid. The minimum radius of
disc needed so that light is not coming out is,
(b) 3 m
(d) 4 m
(a) ∞
8
(c) 6
m
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