Optical Instruments: Human Eye

What is the function of aqueous humour in eyes?

The vascular layer of the eye is

Which of the following statements is correct regarding rods and cones in the human eye?

Which of the following helps to keep the shape of the eye?

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 presbyopic patient can see objects only when they lie between $50 \mathrm{cm}$ and $200 \mathrm{cm}$ from the eye. Then the focal length of the correcting lens required while reading is 

Loss of ability of eye to focus on near and far object with advancing age is called

The focal length of the eye lens increases when eye muscles: 

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 :

Assertion: If a glass slab is placed on the letters of different colours, the apparent depth will be minimum for the violet-coloured letters.

Reason: The speed of light in the glass is maximum for violet colour among all the visible colours.

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 ?

Match the column according to correct $\mathrm{v} \mathrm{v}/\mathrm{s} \mathrm{u}$ graph for real object.

(A)	Concave mirror	(P)
(B)	Convax mirror	(Q)
(C)	Convax (Converging) lens	(R)
(D)	Concave (diverging) lens	(S)

The change in focal length of an eye lens is caused by the action of the

Which part of the human eye controls the amount of light entering into the eyes?

Which of the following is the defect in which we see gradual loss of the accommodation property of the eye due to ageing?

The change that occurs in the eye to see the distant objects clearly is 

Far point of a person is $150 \mathrm{cm}$. Calculate the focal length and power of a lens required to make him see correctly :-

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

Minimum and maximum distance should be for a clear vision of the healthy eye

Aqueous humour plays an important role in maintaining the shape of the eye.