Advertisements
Advertisements
प्रश्न
What changes the shape of lens in the eye?
उत्तर
The ciliary muscles change the shape of the eye lens and thereby adjust its focal length to enable us to see objects that are near or far away.
APPEARS IN
संबंधित प्रश्न
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 spectacle lenses will converge light rays or diverge light rays.
Fill in the following blank with suitable word:
The part of eye sensitive to light is...................
Fill in the following blank with suitable words:
When light is dim, the pupil becomes................
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
Why does the eye-lens not have to do all the work of converging incoming light rays?
Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
Which of these persons can donate eyes?
Name the following:
The type of lens used for correcting myopia.
Name the capacity of the eye lens to change its focal length as per need.
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 |
