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प्रश्न
Draw a scientifically correct labelled diagram of a human eye and answer the questions based on it:
- Name the type of lens in the human eye.
- Name the screen at which the maximum amount of incident light is refracted?
- State the nature of the image formed of the object on the screen inside the eye.
उत्तर
- The human eye's lens is a transparent, crystalline double convex lens.
- Maximum amount of incident light is refracted inside the eye at the outer surface of the cornea.
- The image of the object created on the inside screen of the eye is real and inverted.
APPEARS IN
संबंधित प्रश्न
Write the function of the following part of the human eye: crystalline lens
Write short notes on the following: Retina
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
State whether these lenses are thicker in the middle or at the edges.
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
Which lens bends the light rays more strongly?
Name two parts of the eye which refract light rays (or bend light rays).
What is the:
far point of a normal human eye?
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.
There are two types of light-sensitive cells in the human eye:
Where are they found?
Which part brings the image into sharp focus on the retina? How does it do this?
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?
A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man?
(a) The near point of his eyes has receded away.
(b) The near point of his eyes has come closer to him.
(c) The far point of his eyes has receded away.
(d) The far point of his eyes has come closer to him.
Which of the following have a wider field of view?
(a) Animals having two eyes on the opposite sides of their head.
(b) Animals having two eyes at the front of their head.
The animals of prey have:
(a) two eyes at the front
(b) two eyes at the back
(c) two eyes on the sides
(d) one eye at the front and one on the side
Name the following:
The photoreceptors found in the retina of the eye.
Mention if the following statement is true (T) or false (F) Give reason.
Sometimes medicines dropped into the eyes come into the nose and even throat
Mention if the following statement is true (T) or false (F) Give reason.
Short-sightedness and hyperopia are one and the same thing
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during near vision?
Give scientific reason:
We cannot clearly see an object kept at a distance less than 25 cm from the eye.
Define the following:
Blind spot
Differentiate between:
Vitreous humour and Aqueous humour.
Mention, if the following statement is True or False
The least distance of distinct vision for the human eye is 25 cm
For the normal human eye, the near point is at ___________ cm.
For a healthy human eye, the distant point is infinite distance.
Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.
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.
At noon the sun appears white as
Write down the names of parts of the eye in the blank spaces shown in the figure.
______ 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 |
Which cells of the retina enable us to see coloured objects around us?
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 aqueous humor?
Vitreous humour is present between ______.
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 |
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 |
Which of the following is responsible for the adjustment of the size of pupil?
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 terms in column I with those in column II and write down the matching pairs.
| Column I | Column II | ||
| (i) | Conjunctiva | (a) | Viral infection |
| (ii) | Cornea | (b) | Ciliary body |
| (iii) | Choroid | (c) | Spiral-shaped |
| (iv) | Cochlea | (d) | Transparent epithelium |
| (v) | Conjunctivitis | (e) | Suspensory ligament |
| (f) | Contains melanin | ||
| (g) | Transparent but appears black |
