The Eye and Defects of Vision

A certain far-sighted person cannot see objects closer to the eye than$100 \mathrm{cm}$. The power of lens which will enable him to read at a distance of $25 \mathrm{cm}$ will be 

A person cannot see the objects clearly which are nearer than $50 \mathrm{cm}$ and farther than $4 \mathrm{m}.$ For normal vision, he should wear a bi-focal lens in which :

A far sighted person can see the objective which are at least $50 \mathrm{cm}$ distance and cannot see nearer to it. What should be the power of the lens he should wear, so that he can see the object even at $25 \mathrm{cm}$ distance ?

What is hypermetropia? What is its remedy?

What is myopia? What is its remedy?

What is near point focusing and normal focusing?

When we see an object, the image formed on the retina is
(Choose from the following: real/ virtual)

If the eyeball is shorter, then a probable defect would be

The near point of hypermetropic eye is $40 \mathrm{c}\mathrm{m}$. The lens to be used for its correction should have the power $+$_____ $\mathrm{D}$

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

What is myopia? Which lens is used for its correction? 

Which part of the eye is made up of a transparent jelly-like proteinaceous material?

The near point of hypermetropic eye is $40 \mathrm{c}\mathrm{m}$. The lens to be used for its correction should have the power

Assertion: If you focus on a point closer to your eyes the radius of curvature of eye lens decreases.

Reason: When rays are to be focused more strongly, a shorter focal length is required.

Assertion: Human eye can see virtual object.

Reason: Virtual object is formed by apparent intersection of incident rays.

For a normal eye, the least distance of distinct vision is

A man who wears glasses of power 3 diopters must hold a newspaper at least $25\mathrm{ }\mathrm{c}\mathrm{m}$ away to see the print clearly. How far away would the newspaper have to be if he took off the glasses and still wanted clear vision?

For normal vision, what is distance of object from eye?

Assertion : If you focus on a point closer to your eyes the radius of curvature of eye lens decreases.

Reason : When rays coming from closer object are to be focussed, a shorter focal length is required