Question

How is the power of a lens related to its focal length? The power of a lens is negative. State whether it is convex or

concave?​

Answer 1

Answer:

Explanation:

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.