A point source is placed at a depth 20 cm below the surface…

Physics Ray Optics Mix Numeric Response

Published on: September 12, 2026

A point source is placed at a depth 20 cm below the surface of water. The light escapes through a circular area of the water with its centre directly above the point source. (µ = 4/3)

(i) The angle subtended by a diameter of the area on the source –

10° 1.8 m 2.6 m

60° 2.2 m 3.4 m

98° 2.4 m 4.0m

30° (ii)If a rubber ring of radius r floats centrally on the water and the ceiling of the room is 2.0 m above the water surface. Find the radius of the shadow of the ring formed on the ceiling, if r = 15 cm– 2.8 m (iii) If radius of the rubber ring is 30 m, then the radius of the shadow formed on the ceiling is – Shadow of the ring will not form

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The correct answer is:

Ans.

(i)

Sol.98 0

(ii)

Sol.2.8m

(iii)

Sol. Shadow of the ring will not form

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