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प्रश्न
What is the unit of power of a lens? Define the unit of power of a lens.
एका वाक्यात उत्तर
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उत्तर
The unit for the power of a lens is a dioptre (D). One dioptre is the power of a lens whose focal length is 1 metre.
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पाठ 2: Refraction of Light - Exercise 7 [पृष्ठ १३२]
