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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