Advertisements
Advertisements
Question
How does the eye adjust itself to deal with light of varying intensity?
Solution
The iris regulates the amount of light entering the human eye by automatically adjusting the size of the pupil according to the intensity of light that the eye receives. If the intensity of light is high, the iris contracts the pupil so as to reduce the amount of light entering the eye. If the intensity of light is low, the pupil expands to allow more light to enter the eye.
APPEARS IN
RELATED QUESTIONS
Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye.
Which part brings the image into sharp focus on the retina? How does it do this?
Name the muscles of the eye responsible for the power of accommodation.
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Name the following:
The most sensitive region of the retina.
Name the following:
Yellow spot and ciliary muscles are found in.
State the Location:
Iris
Choose the Odd One Out:
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 |
Name the following:
Two pigments of the sensory cells.
