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प्रश्न
The unit of power of lens is ______.
विकल्प
Centimetre
Dioptre
Watt
Metre
Dyne
None of these
MCQ
रिक्त स्थान भरें
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उत्तर
The unit of power of lens is dioptre.
Explanation:
The SI unit of power of a lens is dioptre (D), which corresponds to $$1\text{ m}^{-1}$$. Metre is the unit of focal length, and dyne is a unit of force.
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