What is the SI unit of power of a lens called?

Correct option is C

The correct answer is (c) Dioptre.
· The SI unit of the power of a lens is called a dioptre.
· The power of a lens (P) is defined as the reciprocal of its focal length (f) in meters, i.e., P = 1/f.
· A lens with a power of 1 dioptre has a focal length of 1 meter.
· The term "dioptre" is commonly used in optometry to specify the refractive power of lenses.
Information Booster:
· Presbyopic: Refers to presbyopia, a condition associated with aging where the eye exhibits a progressively diminished ability to focus on near objects.
· Myopic: Refers to myopia or nearsightedness, a condition where close objects are seen clearly but distant objects appear blurry.
· Hypermetropic: Refers to hypermetropia or farsightedness, a condition where distant objects are seen more clearly than near objects.