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प्रश्न
When do we consider a student sitting in the class to be myopic? List two causes of this defect. Explain using a ray diagram how this defect of eye can be corrected.
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उत्तर
Myopia means near sightedness, when a student is unable to use clearly far away objects we consider the student to have myopia.
Causes :
Excessive curvature of the eye lens
Alongation of the eyeball
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संबंधित प्रश्न
Name the defect of vision in a person:
whose near point is more than 25 on away.
Name the defect of vision in a person:
whose far point is less than infinity
What is the scientific name of
long-sightedness?
Name the defect of vision in which the eye-lens loses its power of accommodation due to old age.
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?
Which part of the eye is grafted in a needy patient from a donated eye?
Have a look at the posture of this woman who is reading a book and answer the questions which follow:
What kind of looking glasses she needs?
Give Reason:
Older people require glasses to read and write.
Due to elongation of _______ and increase in curvature of the eye lens, a person cannot see distant objects clearly.
Assertion: Myopia is the defect of vision in which a person cannot see distant objects clearly.
Reason: This due to eye-ball being too short.
