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Two similar planoconvex lenses are combi...

Two similar planoconvex lenses are combined together in three different ways as shown in the adjoining figure. The ratio of the focal lengths in three cases will be

A

`2:2:1`

B

`1:1:1`

C

`1:2:2`

D

`2:1:1`

Text Solution

Verified by Experts

The correct Answer is:
B
In each case two plano-convex lens are placed close to each other, and `(1)/(F)=(1)/(f_(1))+(1)/(f_(2))`
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