Geometrical OpticsHard
Question
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 :-
Options
A.2 : 2 : 1
B.1 : 1 : 1
C.1 : 2 : 2
D.2 : 1 : 1
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