1.

a. A myopic person can see the objects up to 2m from the eye Calculate power of thecorrective lens to be used to correct this defect of vision

Answer»

Given distance of far point (D) = 2m

Let f be the focal length of eye lens.

Image distance (distance between eye lens and retina ) for our human eye is always constant and is about 2.5 cm.This is due to the action of ciliary muscles.

Applying lens formula, we get f = -D = -2 cm

but, the power of a lens is reciprocal of focal length.hence. Power = 1/f (f in meters)= 1/-2= - 0.5 dioptre.



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