Human Eye and C...

The power of lens in the spectacles of a person is $$+2D$$. The person suffers from :

The focal length of a normal eye-lens is about:

Inability of the eye to focus on both far and near objects with advancing age is:

In the case of hypermetropia:

A myopic person cannot see distinctly , objects that are :

When objects at different distances are seen by the eye, which of the following remains constant?

What happens when white light passes through a glass prism?

The power of lens, a short sighted person uses is $$- 2 \ D$$. The maximum distance of an object which he can see without spectacles is 

A myopic person can not see objects lying beyond 2m. The focal length and power of the lens required to remove this defect will be?

A long sighted person has a least distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a :