Human Eye and C...

A person can see clearly object only when they lie between 50 cm and 400 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 :

A far sighted person has his near point 50 cm. Find the power of lens he should use to see at 25 cm clearly.

For a person near point of vision is $$100\ cm$$. Then the power of lens he must wear so as to have normal vision, should be:

When Astronauts fly at higher altitude, the sky appears dark because ;

When white light is passed through an upside down (inverted) prism then ................

Focal length of human eye lens is about _____________.

Myopia occurs due to:

Hypermetropia is a synonym for: 

The ability of eye to focus on both near and far objects is called:

For a myopic (short-sighted) eye, rays from far distant objects are brought to focus at a point: