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प्रश्न
List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.
उत्तर
The iris and pupil are the two parts of human eye that controls the amount of light entering the eyes. The iris automatically adjusts the size of the pupil according to the intensity of light received by the eye. If the amount of light received by the eye is large (as during the daytime), then the iris contracts the pupil (makes the pupil small) and reduces the amount of light entering the eye. On the other hand, if the amount of light received by the eye is small (as in a dark room or during night), the iris expands the pupil (makes the pupil large) so that more light may enter the eyes. Thus, the iris regulates (or controls) the amount of light entering the eye by changing the size of the pupil.
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संबंधित प्रश्न
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
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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 converging power of eye-lens will be the maximum?
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With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during near vision?
Define the following:
Blind spot
Give the main function of the following:
Three semicircular canals
A small hole of changing diameter at the centre of Iris is called _______.
Select the option with incorrect identification:
Name the following:
Place of best vision in the retina of the eye.
With reference to human eye answer the question that follow:
Name the part of the eye associated with the regulation of the shape of lens.
