Question

How will the power of a lens change if it's focal length is doubled?​

Answer 1

Answer:

Power is inversely proportional to the focal length. So if the focal length is doubled , the power is reduced by half.

Explanation:

If the power of lens would be doubled, what would its focal length be? ... It is equal to the reciprocal of the focal length of the device: P = 1/f. High optical power corresponds to short focal length. The SI unit for optical power is the inverse metre (m−1), which is commonly called the dioptre.

Hope it help you.

please mark me as brainlist