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Which of the following statements is true? (a) A convex lens has 4 dioptre power having a focal length of 0.25 m (b) A convex lens has –4 dioptre power having a focal length of 0.25 m (c) A concave lens has 4 dioptre power having a focal length of 0.25 m (d) A concave lens has –4 dioptre power having a focal length of 0.25 m |
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Answer» The answer is (a) A convex lens has 4 dioptre power having a focal length 0.25 m Positive value for focal length indicates convex lens. |
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