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A convex lens has its radii of curvature...

A convex lens has its radii of curvature equal. The focal length of the lens is f. If it is divided vertically into two identical plano-convex lenses by cutting it, then the focal length of the plano-convex lens (p = the refractive index of the material of the lens)

A

f

B

`(f)/(2)`

C

2f

D

`(mu- 1)f`

Text Solution

Verified by Experts

The correct Answer is:
C
`f=(R)/(2(""_(a)mu_(g)-1))`

Plano convex lens

`f. =(R)/((""_(a)mu_(g)-1))`
`=2[(R)/(2(""_(a)mu_(g)-1))]`
`f. = 2f`
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