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What is the SI unit of power of a lens?

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in Physics – Class 12 by (135k points)
What is the SI unit of power of a lens?

(a) Watts

(b) Unit less

(c) Diopter

(d) Joule

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I'd like to ask this question from Ray Optics topic in chapter Ray Optics and Optical Instruments of Physics – Class 12

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Correct answer is (c) Diopter

To elaborate: The power of a lens is defined as the reciprocal of its focal length in meters. The expression is given as:

P = \(\frac {1}{f}\)

Where P is the power and f is the focal length in meters. Lens surface power can be found with the index of refraction and the radius of curvature. The SI unit of power of a lens is diopter.

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