Question

In Ramsden eye piece, the two plano convex lenses each of focal length f and separated by a distance 12 cm.  The equivalent focal length(in cm) of the eye piece is          

A

10.5

B

12.0

C

13.5

D

15.5

Medium
Solution
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Correct option is C)

In Ramsden eye-piece, 


Thus, for L = 12,

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