Question

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 1

Answer:

the size of eye ball is 5cm.

Explanation:

Answer 2

Answer:

Explanation:

What is the minimum focal length of the eye lens of a normal person?

minimum power of eye lens is 40D. the far point us at infinity.

Power of eye lens is 40 D.

 

Hence, its focal length = f = 1/P = 1/40 = 0.025 m = 2.5 cm

 

Thus, the radius of curvature of the lens is 2f = 5 cm.

 

These informations can be taken out from the data given.

 

However, the size of eye lens is impossible to find from this.

The size of the human lens is fixed in some range. It does not depend on the focal length or any other factor.