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A biconvex thin lens of radius of curvat...

A biconvex thin lens of radius of curvature R is made up of variable refractive index `mu=2(1+r/d)`. Assume `2d lt lt R`. There are infinite images of the point O, which is placed at a distance R on the principal axis from the lens as shown in the figure. The image is spread along the pricipal axis in a length of (r is the radial distance from P measured perpendicular to principal axis)

A

`R/5`

B

`(2R)/5`

C

`(3R)/5`

D

`(4R)/5`

Text Solution

Verified by Experts

The correct Answer is:
C
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