Two similar plano-convex 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
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
In each case, there is a combination of two plano-convex lenses placed close to each other. Focal length of combination 
is same in all cases, so ratio of focal length in three cases is 
.
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