Human Eye Questions

For a normal eye, the cornea provides power of $40\text{D}$ and the eye lens provides $20\text{D}$. The estimated distance between the retina and the lens is:

A person can see clearly objects only when they lie between $50\text{cm}$ and $400\text{cm}$ from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be: