Dioptre is used to measure ?
Correct answer: A. Lens refractive power
- A. Lens refractive power
- B. Luminous intensity
- C. Power
- D. Distance of heavenly bodies
Explanation
A dioptre is the unit of optical power of a lens, calculated as the reciprocal of its focal length in metres. It is not a unit of luminous intensity or astronomical distance.
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