Define of power of a lens write it's formal and unit.
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The power of the lens is the reciprocal of the focal length of the lens. The SI unit of the power is diopter. it is denoted by D. The power of the convex lens is positive and concave lens is negative. 1 D is the power of the lens whose focal length is 1 meter.
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power of lens is its ability to converge or diverge light ....
P=1/f......unit is diopter (D)
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