Question

15. 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 such that light is not coming out is
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Answer 1

Answer:

Given, Refractive index =35, distance=4m

So with the help of Pythagoras theorem,

sinc=r2+x2x=μ1⇒r=μ2−1h=45−14=9164=44×3=3m