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Question

What is the unit of measurement for optical power of the lens?

This question was previously asked in
SSC CGL 2024 (Tier-I) Previous Year Paper (17-Sep-2024) (Shift 3)
The correct answer is

Diopter

The diopter (D) is the unit of measurement for the optical power of a lens. Optical power is the reciprocal of the focal length (in metres): \(\text{Power (D)} = \dfrac{1}{\text{focal length (m)}}\).

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