An object, a convex lens of focal length...

An object, a convex lens of focal length `20 cm` and a plane mirror are arranged as shown in the figure. How far behind the mirror is the second image formed?

`30 cm`

`20 cm`

`40 cm`

`50 cm`

Text Solution

Verified by Experts

The correct Answer is:

For convex lens,
`1/v-1/-12=1/(+20) rArr v=-30 cm`
This image `I_1` is therfore, `(30+10) cm or 40 cm`
towards left of plane mirror. Therefore, second
image `I_2` (by the plane mirror) will be formed
`40cm` behind the mirror.

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