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Question

# A convex lens of focal length 5 cm is placed at a distance of 6 cm from a wall. How far from the lens should an object be placed so as to form its real image on the wall?

A
30cm
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B
30cm
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C
1.2cm
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D
1.2cm
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Solution

## The correct option is B −30cmGiven:Focal length of lens,f=5cmDistance between lens and screen = distance of image formed from the lens=v=6cmWe know, 1v−1u=1f16−1u=1516−15=1u5−630=1u1u=−130Therefore, the distance of the object from the lens, u=−30cm. Or, the object should be placed 30cm far from the lens on the opposite side of the wall.

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