Question

Define power of a lens​

Answer 1

Explanation:

The power of a lens is defined as the reciprocal of the focal length. ... Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

Answer 2

Answer:

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

Lens power is measured in dioptres (D). Converging (convex) lenses have positive focal lengths, so they also have positive power values.

Diverging (concave) lenses have negative focal lengths, so they also have negative power values.

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