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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

2f

B

f

C

zero

D

infinity

Text Solution

Verified by Experts

The correct Answer is:
D
`1/f=1/(f_(1))+1/(f_(2))`
Given, `f_(1)=-f_(2)`
`therefore1/f=0`, which gives `f=oo`.
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