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प्रश्न
Choose the correct answer.
Aperture controlling passage to light into the eye is ___________
पर्याय
blind spot
pupil
iris
cornea
उत्तर
Aperture controlling passage to light into the eye is iris
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संबंधित प्रश्न
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
What is the principal function of the eye-lens?
How is the amount of light entering the eye controlled?
How does this affect the amount of light entering the eye?
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.
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia
Five persons A, B, C, D and E have diabetes, leukaemia, asthma, meningitis and hepatitis, respectively.
Which of these persons can donate eyes?
We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
Mention, if the following statement is True or False
The least distance of distinct vision for the human eye is 25 cm
A small hole of changing diameter at the centre of Iris is called _______.
The image of an object at an infinite distance is obtained in a real and erect form through a convex magnifying glass.
For a healthy human eye, the distant point is infinite distance.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
______ is a transparent layer.
Name the following:
Place of best vision in the retina of the eye.
Name the following:
Place of no vision in the retina of the eye.
Name the following:
The circular opening enclosed by iris.
Name the following:
The layer of the wall of the eye-ball that corresponds to the black lining of the box of a camera
