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प्रश्न
State the Function:
Iris
उत्तर
It is a muscular screen made up of radial and circular muscles that control the diameter of the central opening—the pupil, according to the intensity of illumination.
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संबंधित प्रश्न
Myopia is an example of ______.
The size of the pupil becomes ______ when you see in dim light.
Match the following:
| Column I | Column II |
| (i) Myopia | (a) Converging power of eye lens becomes low |
| (ii) Hypermetropia | (b) Converging power of eye lens remains the same |
| (c) Converging power of eye lens becomes high |
Name the part of the eye:
which changes the focal length of eye-lens.
What is the range of vision of a normal human eye?
Give the scientific names of the following parts of the eye:
a hole in the middle of the iris.
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
Which of the following controls the amount of light entering the eye?
(a) ciliary muscles
(b) lens
(c) iris
(d) cornea
Which parts of the eye cause rays of light to converge on the retina?
An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus?
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.
yellow spot of the retina is the region of colour vision
Mention if the following statement is true (T) or false (F) Give reason.
Blind spot is called so because no image is formed on it.
Name the following:
The area where the image is formed but not seen by our eye is termed as.
Name the following:
The part of the eye responsible for change in the size of the pupil.
______ is a transparent layer.
Match the following:
| Column - I | Column - II | ||
| 1 | Retina | a | pathway 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 |
Write in proper sequence the names of all the parts of the human eye through which the light rays coming from an object pass before they form an image on the retina.
Differentiate between members of the following pair with reference to what is asked in the bracket.
Aqueous humour and vitreous humour (location).
