Question

What is focal power of a spherical mirror or lens? What may be the reason for using p=
$1 \frac{f}{?} as its exred \\ sito$
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Answer 1

Explanation:

Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device: P = 1/f.

Answer 2

Answer:

$P=\frac{1}{f}$

Explanation:

Focal power of a spherical mirror or lens:It is the degree to which a lens or mirror diverges or converges a light.

Or

Power of a lens or mirror is defined as reciprocal of focal length of a mirror or lens.

If the focal length is large then the power of lens or mirror is small.

If the focal length is small then the power of lens or mirror is large.

Mathematical representation,

$P=\frac{1}{f}$

f=Focal length (in meter)

S.I unit of power is Diopters.