Question

The SI unit of power of a lens is?

• A. Newton
• B. dioptre
• C. joule
• D. metre

Answer 1

Answer:

B. dioptre

• The SI unit of power of a lens is the dioptre (D), which is the reciprocal of the focal length measured in meters.

• A dioptre is equal to the reciprocal of the focal length measured in meters.

• The Power of a lens is the ability of a lens to converge or diverge light rays depending on its focal length.