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Which of the following statements is true ?
(a) A convex lens has 4 dioptre power having focal length 0.25 m.
(b) A convex lens has – 4 dioptre power having focal length 0.25 m.
(c) A concave lens has 4 dioptre power having focal length 0.25 m.
(d) A concave lens has – 4 dioptre power having focal length 0.25 m

Answers (1)

Answer: A

Convex lens has positive power and positive focal length.

$\\\ P=\frac{1}{f}\;\\\ \therefore f=\frac{1}{P}=\frac{1}{4}=0.25\; m$

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