A nearsighted woman has a far point of 314 cm. What kind of lens, converging or diverging, should be prescribe?

A nearsighted woman has a far point of 314 cm. What kind of lens, converging or diverging, should be prescribed for her to see distant objects more clearly?

Answer 1

To correct nearsightedness the object distance is infinity and the image is at -314cm

So from 1/f = 1/do + 1/di we have f = di = -314cm which is -3.14m

So the power is 1/-3.14 = -0.318 diopter
and the lens is diverging

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