What is 1 Diopter equal to?

Correct option is D

The correct answer is (d) 1 m⁻¹.
· 1 Diopter (D) is a unit of measurement for the optical power of a lens, and it is defined as the reciprocal of the focal length of the lens in meters.
· Therefore, 1 D = 1/m or 1 m⁻¹.
Information Booster:
· Diopter is commonly used in optometry to measure the focusing power of lenses.
· A positive diopter value indicates a converging (convex) lens, while a negative diopter value indicates a diverging (concave) lens.
· For example, a lens with a focal length of 0.5 meters has an optical power of +2 diopters (1/0.5 m = 2 D).
· Diopters are also used in the context of eyeglasses and contact lenses to correct vision.