a person needs a lens of power -4.5 D for the correction of equation what is the focal length of corrective lens and its nature
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Power = -4.5 D
so, according to the power formula,
P = 1/f (i)
⇒ f = 1/P ( from i)
So, substituting given power into the equation,
f = 1/-4.5
⇒ f = -0.22/0.23 m ( approx. value)
since focal length is negative, the corrective lens would be a concave lens. concave lens are diverging lens, i.e, meaning that it spreads out light rays that have been refracted through it.
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