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Q.

A point source of light is placed at a distance of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance

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a

f

b

between f and 2f

c

2f

d

more than 2f

answer is C.

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Detailed Solution

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After refraction from the lens all the rays converge at a point at a distance 2f from the lens to form a real image, hence the intensity is maximum at that point.

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