Question

write the lens formula in terms of power​

Answer 1

"The unit by which the refractive power of a given lens is measured is referred to as diopter. Power of a lens can be obtained by representing the reciprocal of its focal length in meters.

If the power of a lens is represented in Diopters and taken as D,

then D = 1/f

where f represents the focal length of the lens in meters.

"

Answer 2

Answer:

$P=\dfrac 1v-\dfrac 1u$

Explanation:

The lens formula is given by

$\dfrac 1f = \dfrac 1v-\dfrac 1u$

where,

$f$ = focal length of the lens.

$u$ = distance of the object from the lens.

$v$ = distance of image of the object from the lens.

The power of a lens is defined as the reciprocal of the focal length of the lens.

$P=\dfrac 1f$

Putting this expression in lens formula,

$P=\dfrac 1v-\dfrac 1u$