Question

the power of lens is-4D. what is the nature of this lens? find the focal length of this lens.​

Answer 1

Answer:

Concave Lens.

Explanation:

The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters.

Hope it helps.

Answer 2

Power of a Lens

The power of a lens is specified as P = 1 F' where f is the focal length.

The S.I. unit of power of a lens is m This is also known as diopter. m-1.

The focal length (f) of a converging lens is considered positive and that of a diverging lens is considered negative. Thus, the power of a converging lens is positive and that of the diverging lens is negative.

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