write the expression of focal power of a spirical mirror
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Solution. Converging or diverging the ability of a lens or of a mirror is defined as its focal power. This implies, the more the power of any spherical mirror or a lens, the more is its ability to converge or diverge the light that passes through it. ... Hence, the expression of focal power is given by the formula, P = .
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It is equal to the reciprocal of the focal length of the device: P = 1/f.
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