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Question
An aperture that controls the passage of light into the eye is ______.
Options
Blind spot
Pupil
Yellow spot
Iris
Solution
An aperture that controls the passage of light into the eye is pupil.
Explanation:
The pupil constricts (gets narrower) to reduce the amount of light entering the eyes.
RELATED QUESTIONS
What is the principal function of the eye-lens?
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
What change is made in the eye to enable it to focus on objects situated at different distances? Illustrate your answer with the help of diagrams.
The term " accommodation" as applied to the eye, refers to its ability to:
(a) control the light intensity falling on the retina
(b) erect the inverted image formed on the retina
(c) vary the focal length of the lens
(d) vary the distance between the lens and retina
The size of the pupil of the eye is adjusted by:
(a) cornea
(b) ciliary muscles
(c) optic nerve
(d) iris
Name two animals having eyes:
one the sides of the head.
With both eyes open, a person's field of view is about:
(a) 90°
(b) 150°
(c) 180°
(d) 360°
The region in the eyes where the rods and cones are located is the
The figure below compares a part of our eye with a part of a photographic camera.
Name the corresponding parts of the eye the camera shown here that are comparable in function.
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
Name the following:
The most sensitive region of the retina.
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:
The image of the object in the human eye is formed on the cross screen.
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 | 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 | f | 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.
Name the following:
The fibres which collectively hold the lens in position.
