The SI unit of the power of a lens is
A. metre
B. dioptre
C. watt
D. joule
1 answer
Best answer
Answer: B. dioptre
Power \(P = \frac{1}{f}\) with \(f\) in metres; its unit is the dioptre (D).
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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