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प्रश्न
Write an Explanation.
Minimum distance of distinct vision
उत्तर
The minimum distance of an object from a normal human eye, at which it is clearly visible without stress on the eye is called as minimum distance of distinct vision.
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संबंधित प्रश्न
Myopia is an example of ______.
Explain the mechanism of vision.
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which lens has a greater focal length?
Out of rods and cones m the retina of your eye:
which work in dim light?
What is the principal function of the eye-lens?
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.
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
Describe and explain, how a normal eye can see objects lying at various distances clearly.
Explain why, we cannot see our seats first when we enter a darkened cinema hall from bright light but gradually they become visible.
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
What shape are your eye-lenses:
when you look at a distant tree?
Which parts of the eye cause rays of light to converge on the retina?
How much is our field of view:
with one eye open?
Out of animals of prey and predators, which have their eyes:
on the opposite sides of their head?
Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
The region in the eyes where the rods and cones are located is the
Name the following:
The part of the eye responsible for its shape.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
Mention the characteristics of the image that falls on the retina of the eye.
Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The part of the eye which can be donated from a clinically dead person is the Retina.
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
Choose the correct answer.
In the chemistry of vision, the photosensitive substance is _________________
Answer the following question.
Write the structure of eye lens and state the role of ciliary muscles in the human eye.
Name the following:
The most sensitive region of the retina.
Give Technical Term:
The nutritive layer of the eye which also presents reflection of light.
Mention, if the following statement is True or False
Cones are the receptor cells in the retina of the eye sensitive to dim light.
Choose the Odd One Out:
Complete the following sentence with appropriate Word
The part of the human eye where rod cells and cone cells are located is the:
Long answer question
Draw the neat labelled diagram of the Sectional view of the human eye.
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?
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.
We cannot distinguish colours in dim light. Explain giving suitable reasons.
Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
______ of the eye is comparable to the film of a camera.
Match the following
| 1. | Conjunctiva | a. | Coloured part of eye |
| 2. | Cornea | b. | Photosensitive layer |
| 3. | Iris | c. | Refraction |
| 4. | Retina | d. | Protection |
In human eye the part which allows light to enter into the eye is ______.
The change in the focal length of an eye lens in human beings is caused by the action of ______.
With reference to human eye, answer the following question.
What is blind spot?
Name the following:
Place of no vision in the retina of the eye.
