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प्रश्न
The figure below compares a part of our eye with a part of a photographic camera.
Explain the mode of working and the functions of the parts of the eye mentioned above.
उत्तर
The cornea is the eye's main focusing element. It takes widely diverging rays of light and bends them through the pupil; the rays are further converged by the lens.
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संबंधित प्रश्न
What job does the pupil of the eye do?
What is the:
far point of a normal human eye?
Fill in the following blank with suitable word:
Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
Fill in the following blank with suitable word:
To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made....................
There are two types of light-sensitive cells in the human eye:
Where are they found?
There are two types of light-sensitive cells in the human eye:
To what is each type of cell sensitive?
How does the convex eye-lens differ from the ordinary convex lens made of glass?
Explain the functions of the following parts of the eye:
(i) cornea
(ii) iris
(iii) pupil
(iv) ciliary muscles
(v) eye-lens
If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?
Name two animals having eyes:
one the sides of the head.
What is a lacrimal gland?
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
Choose the correct answer.
Aperture controlling passage to light into the eye is ___________
What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.
Name the following:
The region in the eye where the rods and cones are located.
Write an Explanation.
Power of accommodation
The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.
Why the human eye is compared with camera?
| 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 accomodation |
Chris was watching the display of fireworks in the sky.
- Trace the path of the light rays using the following terms:
Fovea, Lens, Conjunctiva, Pupil, Cornea. - Name the nerve that carries the impulse for vision to the brain.
