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प्रश्न
State the Function:
Cornea
उत्तर
It covers and protects the iris and allows light rays into the eye.
APPEARS IN
संबंधित प्रश्न
Compare the following: Choroid and retina
What is the name of:
the curved, transparent front surface of the eye?
What is the:
near point of a normal human eye?
Give the scientific names of the following parts of the eye:
muscles which change the shape of the eye-lens.
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
Why does the eye-lens not have to do all the work of converging incoming light rays?
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Mention if the following statement is true (T) or false (F) Give reason.
Short-sightedness and hyperopia are one and the same thing
State the function of each of the following parts of the human eye:
(i) Cornea
(ii) Iris
(iii) Pupil
(iv) Retina
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.
Give scientific reason:
One can sense colours only in bright light.
Define the following:
Power of accommodation
What are the functions of tears?
Name the following:
The most sensitive region of the retina.
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
From where the following nerves arise.
Optic nerve
______ is a transparent layer.
What is ‘white of the eye’?
Match the following:
| Column - I | Column - II |
| 1. Retina | a) Path way of light |
| 2. Pupil | b) Far point comes closer |
| 3. Ciliary muscles | c) near point moves away |
| 4. Myopia | d) Screen of the eye |
| 5. Hypermetropia | e) Power of accommodation |
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
