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Power and Thin Lenses in Contact

A converging ...

Question

A converging and a diverging lens of focal lengths are placed coaxially in contact .find the power and focal length of combination

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Solution

Let the focal length of both the lenses be f.
Focal length of the combinationis F given by
1/F = (1/f)+(1/-f) = 0
or, F is infinity.

Since focal length is infinity then power will be zero

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