Two similar plano-convex lenses are combined together in three differe – McqOptions

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1.	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.	2 : 2 : 1
B.	1 : 1 : 1
C.	1 : 2 : 2
D.	2 : 1 : 1
Answer» C. 1 : 2 : 2

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