Question

What is the power of a lens? State the S.I unit of the power of the lens and the power of the lens to

the centre length of the lens. Write a formula corresponding to the power of the lens with the centre

length of the lens.​

Answer 1

Power of lens is known as the inverse of the focal length of the lens measured in meter(m). Power of lense = 1/ focal length in meter. The lense used is a convex lens because the focal length is a positive value. The lense used is a concave lens because the focal length is a negative value.