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The adjacent figure shows a thin plano-c...

The adjacent figure shows a thin plano-convex lens of refractive index `mu_1` and a thin plano-concave lens of refractive index `mu_2`, both having same radius of curvature R of their curved surfaces. The thin lens of refractive index ` mu_3` has radius of curvature R of both its surfaces. This lens is so placed in between the plano-convex and plano-concave lenses that the plane surfaces are parallel to each other.
The focal length of the combination is

A

`R/((mu_1+mu_2-mu_3-1))`

B

`R/((mu_1+mu_2+mu_3))`

C

`R/((mu_1-mu_2))`

D

`R/((mu_1-mu_2-mu_3-3))`

Text Solution

Verified by Experts

The correct Answer is:
C
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