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प्रश्न
State one role of ciliary muscles in the human eye.
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उत्तर
The ciliary muscles in the eye support the lens and hold it in place. They also change the shape of lens by contracting or relaxing. This process is called accommodation.
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संबंधित प्रश्न
Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.
A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard.
How can this defect by corrected?
The defect of vision in which the eye-lens of a person gets progressively cloudy resulting in blurred vision is called:
(a) myopia
(b) presbyopia
(c) colourblindness
(d) cataract
A short-sighted person has a near point of 15 cm and a far point of 40 cm.
(a) Can he see clearly an object at a distance of:
(i) 5 cm?
(ii) 25 cm?
(iii) 50 cm?
(b) To see clearly an object at infinity, what kind of spectacle lenses does he need?
To read a book held at a distance of 25 cm, will she need converging or diverging spectacle lenses?
Explain the Term: Cataract
The diagram given below represents the cross-section of the human eye:
(i) Name the parts labeled 1—12.
(ii) What is the function of the part marked ‘10’?
(iii) What would happen if part ‘5’ is damaged or cut?
Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.
Which of the following statement is correct?
