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For converging lenses, the power is but for diverging lenses the power is .

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Detailed Solution

For converging lenses, the power is positive, but for diverging lenses, the power is negative.
As the power of a lens is defined as the reciprocal of the focal length, it is denoted as

P = \frac{1}{f}

(Where

f

is the focal length of the given lens)
Convex lenses converge and have positive power because their focal lengths are positive. Concave lenses diverge and have a negative power because their focal length is negative.

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