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
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a
2 : 2 : 1
b
1 : 1 : 1
c
1 : 2 : 2
d
2 : 1 : 1
answer is B.
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Detailed Solution
In each case two plane-convex lens are placed close to each other, and 1F=1f1+1f2=12f+12f=1f F=f