If the distances of an object and its vi...

If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is

A

4 cm

B

(`sqrt+1`)cm

C

`2sqrt2` cm

D

(`2+sqrt2`) cm

Text Solution

Verified by Experts

The correct Answer is:

B

(b) As per question,
`because1/(-(f+1))-1/(-(f-1))=1/f`

On solving, we get f=`(sqrt2+1)cm`

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