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power of lens is the degree of convergence and divergence of a given lens.
it is the reciprocal of focal length in metres. if focal length is -20 cm then the lens if concave lens.
P= 1/f (in m.)
P = 1/-0.2 D
P = -5 D
it is the reciprocal of focal length in metres. if focal length is -20 cm then the lens if concave lens.
P= 1/f (in m.)
P = 1/-0.2 D
P = -5 D
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