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प्रश्न
What happens to the eye when you enter a darkened cinema hall from bright sunshine? Give reason for your answer.
उत्तर
When we are in the bright sun, the pupil of the eye contracts and lets in minimum light. However, when we enter a darkened cinema hall, the pupil does not immediately dilate and we are unable to see in the low-light conditions. But, after some time, the pupil opens to allow more light into the eye and we are able to see clearly.
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संबंधित प्रश्न
Draw a neat and labelled diagram of the structure of the human eye.
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?
Given below is certain structure. Write against them its functional acivity.
retina and ……………………….
What is a Lachrymal gland?
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.
Explain the structure and functioning of Human eye. How are we able to see nearby as well as distant objects?
______ of the eye is comparable to the film of a camera.
Which cells of the retina enable us to see coloured objects around us?
The innermost layer of human eye is ______.
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 |
