Advertisements
Advertisements
प्रश्न
Which of the following is responsible for the adjustment of the size of pupil?
पर्याय
Iris
Sclera
Lens
Choroid
उत्तर
Iris
Explanation:
The iris is also an extension of the choroid, partially covering the lens and leaving a circular opening in the centre, the pupil.
संबंधित प्रश्न
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.
Explain the mechanism of vision.
Name two parts of the eye which refract light rays (or bend light rays).
What changes the shape of lens in the eye?
Mention, where in living organism is the following located and state their main function:
Fovea centralis
Write whether the following is true or false:
Rods are the receptor cells in the retina of the eye sensitive to dimlight.
The diagram alongside represents a certain defect of vision of the human eye.
(i) Name the defect.
(ii) Describe briefly the condition in the eye responsible for the defect.
(iii) Redraw the figure by adding a suitable lens correcting the defect. Label the parts through which light-rays pass.
(iv) What special advantage do human beings derive in having both eyes facing forward?
What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.
What are the functions of tears?
What is a stereoscopic vision?
Name the following:
The pigmented circular area seen in the eye.
Name the following:
Fluid present in the posterior chamber of the eye.
Name the capacity of the eye lens to change its focal length as per need.
The following figure show the change in the shape of the lens while seeing distant and nearby objects. Complete the figures by correctly labelling the diagram.
Which cells of the retina enable us to see coloured objects around us?
| 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 accomodation |
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 accomadation |
Chris was watching the display of fireworks in the sky.
- Trace the path of the light rays using the following terms:
Fovea, Lens, Conjunctiva, Pupil, Cornea. - Name the nerve that carries the impulse for vision to the brain.
Name the following:
Place of best vision in the retina of the eye.
An aperture that controls the passage of light into the eye is ______.
