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Question

An object is placed at 15 cm in front of convex lens of focal length 10 cm. Where shall we place a convex mirror of focal length 13 cm so that real image and object coincide?

A
6 cm from lens
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B
3 cm from lens
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C
4 cm from lens
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D
2 cm from lens
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Solution

The correct option is C 4 cm from lens
From lens formula, 1v1u=1f1v=110115

or v=30cm.

In order the ray to retrace the path, the ray must be incident normal on the mirror. Hence distance of mirror from I should be equal to R=2f=26cm or 4cm from lens.

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