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Two identical thin planoconvex lenses of...

Two identical thin planoconvex lenses of refractive index n are silvered, one on the plane side and other on the convex side. The ratio of their for lengths is

A

`n//(n-1)`

B

`(n-1)//n`

C

`(n+1)//n`

D

n

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The correct Answer is:
A
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