A short sighted person cannot see clearly beyond 40cm. Calulculate the power of lens to correct vision of the person.
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Here, focal length(f) = 40 cm = 0.4m
and corrective lens is convex, thus f = +ve
P=1/f
= 1/0.4
= 2.5D
Therefore, The power of corrective lens is 2.5 dioptre
and corrective lens is convex, thus f = +ve
P=1/f
= 1/0.4
= 2.5D
Therefore, The power of corrective lens is 2.5 dioptre
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