alleryThe power P of a lens of focal length f (in metres) is given by
AP = c / f
BP = f / 100
CP = 1/f
DP = f²
Answer & Solution
Correct answer: C. P = 1/f
1. Power of a lens P = 1 / f (with f in metres).
2. Unit: dioptre (D). 1 D = 1 m⁻¹.
3. Convex lenses have P > 0, concave lenses P < 0.
_Source: syllabus Physics Part II, Ch 9 §9.5.3_
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