If the power of a convex lens is 4 dioptere, its focal length is a)0.25cm b)0.25m c)25cm d)25m .Give reason why you chosen the answer of particular unit i.e. cm or m ?
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If the power of a convex lens is 4 dioptere, its focal length is a)0.25cm b)0.25m c)25cm d)25m .Give reason why you chosen the answer of particular unit i.e. cm or m ?
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=>4=1/f
=>f=1/4=0.25 m
it will metre as Dioptre is measured in metre
pls mark brainliest