If the focal length of a lens is -0.25 m, what is its power in dioptres? - OPTICS Quiz | GKFix.in

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Question

If the focal length of a lens is -0.25 m, what is its power in dioptres?

A. +4.0 D
B. +0.25 D
C. -0.25 D
D. -4.0 D