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Question

An object is placed at 40 cm from the optic centre of a convex lens on its principal axis. if the focal length of the lens is 24 cm, find how far from the lens the screen should be placed to obtain a well-defined image.

A
48 cm
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B
38 cm
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C
50 cm
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D
60 cm
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Solution

The correct option is D 60 cm
given: u=40cm
f=24cm
solution:from lens formula
1v1u=1f
1v+140=124
1v=124140=16960=160
v=60cm

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