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When a thin convex lens is put in contac...

When a thin convex lens is put in contact with a thin concave lens of the same focal length (f), then the resultant combination has focal length equal to

A

f/2

B

2f

C

0

D

`oo`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) Resultant combination of focal length,
`F_(comb)=(f_(1)f_(2))/(f_(1)+f_(2))=(f(-f))/(f+(-f))=oo`
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