Power of a lens is -4 dioptre it's focal length is
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Power of the lens, P = -4 D
let its focal length be f
so, P=1/f => f = 1/P = 1/(-4) = -1/4 = -0.25 m = -25 cm
Therefore, focal length of the lens is -25 cm.
let its focal length be f
so, P=1/f => f = 1/P = 1/(-4) = -1/4 = -0.25 m = -25 cm
Therefore, focal length of the lens is -25 cm.
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