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Question

If two thin lenses of focal length f1 and f2 are kept in contact to each other, then the equivalent focal length of the combination

A
f1f2f1+f2
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B
f1f2f1f2
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C
f1+f2f1f2
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D
f1f2f1f2
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Solution

The correct option is A f1f2f1+f2
Net Power of a combination of lens is sum of their individual power i.e.
Pnet=P1+P2
1fnet=1f1+1f2
fnet=f1+f2f1f2
fnet=f1f2f1+f2

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