Question

find the power of of convex lens of focal length ​

Answer 1

Explanation:

If a lens has a shorter focal length it is said to be more powerful. 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.

Answer 2

The power of convex lens is,

P=f1

Putting the value of focal length we get,

P=21=0.5 D