alleryPower P of a lens is defined as:
AP = f (in metres)
BP = v / u
CP = u / v
DP = 1/f, in dioptres
Answer & Solution
Correct answer: D. P = 1/f, in dioptres
P = 1/f where f is focal length in metres. Unit: dioptre (D).
Convex lens has positive P; concave negative.
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