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प्रश्न
The change in focal length of an eye lens is caused by the action of the ______.
पर्याय
pupil
retina
ciliary muscles
iris
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उत्तर
The change in focal length of an eye lens is caused by the action of the ciliary muscles.
Explanation:
The ciliary muscles change the focal length of the eye lens by changing its shape.
संबंधित प्रश्न
Why is a normal eye not able to see clearly the objects placed closer than 25 cm?
Write the name.
The persons which are unable to distinguish between different colours
Write an Explanation.
Persistence of vision
The 'eye muscles' are controlled by which cranial nerves?
The ability of the eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called:
The focal length of the eye lens increases when eye muscles ____________.
The least distance of distinct vision for a normal eye is ____________.
When light rays enter the eye, most of the refraction occurs at the
How are we able to see nearby and also the distant objects clearly?
A piece of red glass is heated till its glows in dark. The colour of flowing glass would be:-
In the blind spot of the human eye ______.
In simple microscope ______ lens is used.
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Define the following term:
Adaptation
Differentiate between members of the following pair with reference to what is asked in the bracket.
Near and distant accomodation (shape of lens).
Differentiate between members of the following pair with reference to what is asked in the bracket.
Dark and light adaptation (pigments which will be regenerated).
The figures (A) and (B) given below are showing some kind of adjustment. Study the figures and answer the questions that follow.
| A |  |
 |
B |
- Identify the kinds of adjustments done in the figures (A) and (B).
- Distinguish between the adjustments of figures (A) and (B) on the basis of:
- The size of pupil.
- The pigment which gets regenerated.
- Cells of the retina.
