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Express the combined power of two lenses...

Express the combined power of two lenses, one of focal length `+f_(1)` and of the other `-f_(2)` in contact with each other.

Text Solution

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`(1)/(f)=(1)/(f_(1))+(1)/(-f_(2))`
where .f. is in metre.
i.e., `P=(P_(1)-P_(2))`
and .P. is in dioptre.
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