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Byju's Answer
Standard XII
Physics
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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