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Q.

A converging beam of light is incident on a concave lens of focal length 20 cm such that in the absence of the lens the beam would converge at a distance of 10 cm from the lens. Then the distance of the point from the lens where the beam will converge after refraction through the lens is 

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a

20 cm

b

15 cm

c

40 cm

d

30 cm

answer is B.

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Detailed Solution

Here the object is virtual 

∴u=+10, f=-20

∴1v-1(+10)=1(-20)⇒v=20 cm

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