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प्रश्न
Write an Explanation.
Power of accommodation
उत्तर
The capacity of the eye lens to change its focal length as per need is called as its power of accommodation.
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संबंधित प्रश्न
Write the function of the following part of the human eye: crystalline lens
Explain the mechanism of vision.
Draw a neat and labelled diagram of the structure of the human eye.
Name two parts of the eye which refract light rays (or bend light rays).
What is the function of the lens in the human eye?
What job does the pupil of the eye do?
Out of rods and cones m the retina of your eye:
which work in dim light?
What changes the shape of lens in the eye?
What is the:
far point of a normal human eye?
What is the range of vision of a normal human eye?
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared to the night vision of an owl?
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
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?
Why does the eye-lens not have to do all the work of converging incoming light rays?
When is a person said to have developed cataract in his eye? How is the vision of a person having cataract restored?
Name two animals having eyes:
one the sides of the head.
We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
Name the following:
Short sightedness.
Give the main function of the following:
Fovea centralis
Name the following:
The opening through which light enters the eyes.
Choose the correct answer.
Aperture controlling passage to light into the eye is ___________
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.
Name the following:
The pigmented circular area seen in the eye.
Name the following:
The most sensitive region of the retina.
Name the following:
The area where the image is formed but not seen by our eye is termed as.
Name the following:
The region in the eye where the rods and cones are located.
Name the following:
The type of lens used for correcting myopia.
Complete the following sentence with appropriate Word
The photoreceptor cells of the retina sensitive to colour are:
The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.
______ is tough and thick white sheath that protects the inner parts of the eye.
Draw the struture of human eye and label its parts.
The image formed on the retina of the human eye is ____________.
The innermost layer of human eye is ______.
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 |
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 accomadation |
State the functions of the following:
Ciliary muscles
Name the following:
The circular opening enclosed by iris.
Name the following:
The layer of the wall of the eye-ball that corresponds to the black lining of the box of a camera
Name the following:
Three layers of the eye ball.
