A lens has a power of 0.1 d it is (a) concave lens of focal length 10 cm (b) concave lens of focal length 10m (c) convex lens of focal length 10m
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c. convex lens of focal length 10 m ...because if the power is positive that is + 0.1 it will always convex lens only
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(c) convex lens of focal length 10m
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