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A person needs a lens of power - 4.5 D f...

A person needs a lens of power - 4.5 D for correction of her vision.
What is the focal length of the corrective lens?

Text Solution

Verified by Experts

Given that
Power, `P= -4.5 D`
As we know,
`P = 1//f`
`rArr f = 1//P = 1//-4.5 =-0.22 m=-22.2 m`
`-22.2` cm is the focal length of the corrective lens
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