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प्रश्न
State the Function:
Iris
उत्तर
It is a muscular screen made up of radial and circular muscles that control the diameter of the central opening—the pupil, according to the intensity of illumination.
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संबंधित प्रश्न
Which. of the following has normal vision?
(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc
Name the part of the eye:
on which the image is formed.
How does the eye adjust to take account of an increase in brightness?
Out of rods and cones m the retina of your eye:
which work in dim light?
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.
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
The term " accommodation" as applied to the eye, refers to its ability to:
(a) control the light intensity falling on the retina
(b) erect the inverted image formed on the retina
(c) vary the focal length of the lens
(d) vary the distance between the lens and retina
Which of the following controls the amount of light entering the eye?
(a) ciliary muscles
(b) lens
(c) iris
(d) cornea
What shape are your eye-lenses:
when you look at a distant tree?
Mention if the following statement is true (T) or false (F) Give reason.
Ciliary muscles regulate the size of the pupil
In what two ways is the yellow spot different from the blind spot?
Name the following:
The type of lens used for correcting myopia.
Choose the Odd One Out:
Vision defect that increases distance between the lens of the eye and retina of the eye is termed as myopia.
At noon the sun appears white as
Name the part of the eye which gives colour to the eyes.
An aperture that controls the passage of light into the eye is ______.
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 |
Where is the following located?
Yellow spot
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the shape of lens.
