Question

Q.9. What is power of lens ?​

Answer 1

Answer:

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

Answer 2

Answer:

if a lens has shorter focal length it is said to be more powerful.The power of a lens is defined as the reciprocal of the focal length .Leans power is measured is dipoters dividing lenses have negative focal length.