A point source of light `S` is placed at the bottom of a vessel containing a liquid of refractive index `5//3`. A person is viewing the source from above the surface. There is an opaque disc of radius `1 cm` floating on the surface. The centre of disc lies vertically above the source `O`. The liquid from the vessel is gradually drained out through a tap. What is the maximum height of the liquid for which the source cannot be seen at all.
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Correct Answer - D Force on base = mg of liquid implies `F_(1)=F_(2)`
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Correct Answer - `5^(@)`
2 Answers 1 views
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Correct Answer - `(60)/(13)cm`
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Correct Answer - `5 xx 10^(-10) s`
2 Answers 1 views
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Correct Answer - n=7
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Correct Answer - `0^(@)`
2 Answers 1 views
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Correct Answer - 1.321
2 Answers 1 views
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Correct Answer - Rays beyond the circle are totally reflected into the liquid, Radius `=(h)/(sqrt(mu^(2)-1))` Area `=(pi h^(2))/(mu^(2)-1)`
2 Answers 3 views
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Correct Answer - (i) - 8f (ii) `+3.25f` (iii) `oo`
2 Answers 1 views