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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 two lenses of focal lengths, `F_(1)` and `f_(2)` are kept in contact with each other , the focal length (f) of the combination is given by `1/f =(1)/(f_(2)) +(1)/(f_(2))`/

If `P_(1) and P_(2)` are the powers of these lenses, the power (P) of the combination is given by `P=P_(1)+P_(2)`
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