Question

❄️Refer to the attachment please
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Answer 1

Explanation:

From lens formula,

1/v - 1/u=1/f =>1/v

1/v = 1/10-1/15

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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