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Q.

A converging beam of light is incident on a concave lens of focal length 40 cm. In the absence of lens, the beam converges at a point 20 cm behind the lens. After refraction, the beam

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a

converges to 10 cm behind the lens

b

diverges to 20 cm behind the lens

c

converges to 12 cm

d

converges to 40 cm behind the lens

answer is D.

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Detailed Solution

Question Image

1f=1v−1u

1−40=1v−120,v=40cm

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