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If two lenses of focal lengths f(1) and ...

If two lenses of focal lengths `f_(1) and f_(2)` are kept in contact with each other, state the formula for the focal length of the combination . If `P_(1)` and `P_(2)` are the powers of these lenses, state the formula for the power of the combination.

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If powers of two lenses are `P_(1) and P_(2)` then the power of their combination is given by the formula `P = P_(1) + P_(2)`.
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