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प्रश्न
Differentiate between:
Yellow spot and Blind spot.
उत्तर
| Yellow Spot | Blind Spot |
| (i) It has only cone cells. | It has neither cone cells nor rod cells. |
| (ii) Clear images are formed here. | No images are formed here. |
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संबंधित प्रश्न
Write the function of retina in human eye.
Distinguish between: aqueous humor and vitreous humor
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Are these lenses thinner at the middle or at the edges?
What is the function of the lens in the human eye?
Refraction of light in the eye occurs at:
(a) the lens only
(b) the cornea only
(c) both the cornea and the lens
(d) the pupil
The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
(v) on the screen of a slide projector?
Which part brings the image into sharp focus on the retina? How does it do this?
Name two animals having eyes:
at the front of the head.
Name the following:
The opening through which light enters the eyes.
Choose the correct answer.
Aperture controlling passage to light into the eye 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:
Fluid present in the posterior chamber of the eye.
State the Location:
Iris
State the Function:
Iris
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.
Write down the names of parts of the eye in the blank spaces shown in the figure.
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 |
Assertion (A): Rods and Cones are photoreceptors in the sclera of eyeball.
Reason (R): Rods are sensitive to dim light.
Given below is a cross section of the human eye. Match the structures marked (a) to (e) with their correct functions:
Example: (f) - 6. Holds the lens in position
| Cross section of Human Eye | Functions | |
 |
1. | Protects retina |
| 2. | Regulates the size of the pupil | |
| 3. | Alters the shape of the lens | |
| 4. | Keeps the lens moist | |
| 5. | Transmits nerve impulses to brain | |
| 6. | Holds the lens in position |
Name the following:
Capacity of the eye to focus at different distances.
