Two thin lenses of focal lengths f1 and f2 are placed in contact with each other. The focal length of the combination will be given by:
A
f1f2f1−f2
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B
√f1f2
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C
f1f2f1+f2
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D
f1+f22
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Solution
The correct option is C
f1f2f1+f2
The power of a lens is defined as the reciprocal of its focal length (in metres). When there is a combination of two lenses in contact, the effective power of the combination is the sum of the individual powers.