alleryPower of a lens has the SI unit:
ANewton
BWatt
CDioptre
DLumen
Answer & Solution
Correct answer: C. Dioptre
1. Power P = 1 / f where f is in metres.
2. So power has the unit of inverse metre.
3. This unit is called the dioptre (D).
4. So the SI unit of power of a lens is the dioptre.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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