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A point source of light S is placed at t...

A point source of light S is placed at the bottom of a vessel containg 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 the disc lies vertically above the source S. 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 at all be seen from above?

A

1.50 cm

B

1.64 cm

C

1.33 cm

D

1.86 cm

Text Solution

Verified by Experts

The correct Answer is:
C
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