Which of the following statements is true? * a. A convex lens has 4 dioptre power having focal length 0.25m b. A convex lens has -4 dioptre power having focal length 0.25m c. A concave lens has 4 dioptre power having focal length 0.25m d. A concave lens has -4 dioptre power having focal length 0.25m
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Answer:
A
Explanation:
as convex lens has positive focal length and power=1/focal length
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