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A convex lens of focal length 40cm is he...

A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm.

Q. If the convex lens is replaced by a concave lens of focal llength 60cm, it gives rise to an image coincident with itself. then the value of d is

A

20cm

B

30cm

C

40cm

D

60cm

Text Solution

Verified by Experts

The correct Answer is:
c.
Here `f=-60cm`
`(1)/(-24)-(1)/(-d)=(1)/(-60)`
`d=40cm`
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