Which of the following statements is/are true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has -4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dioptre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre having a focal 0.25 m
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The required Option (a) "A convex lens has 4 dioptre power having a focal length 0.25 m" is correct. Explanation: The power of a convex lens is positive. Hence, focal length of convex lens is also positive.
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