Q. 195.0( 2 Votes )

The minimum power of the eye lens is 40 D. If the far point of the normal eye is infinity. Find the size of the eye ball.

Answer :

Power of eye lens = P

P = 40 D


Focal length = f


f =


f =


= 0.025 m


= 2.5 cm


Radius of curvature = 2f


= 5 cm


The eye ball has the radius of 5 cm


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