Question

Power of a lens is -4 diopter. its focal length will be?​

Answer 1

Power=1/focal length

Hence, focal length =1/power

F=1/-4

F=-0.25m

Answer 2

Power = 1/f (In meters)

-4 = 1/f

1/-4 = f

f = - 0.25 meters

focal length (f) = -25 cm

Therefore, the focal length of the lens will be -25 cm

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