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Question
What is Hypermetropia (far sightedness)?
Solution
Hypermetropiais a defect of vision in which a person cannot see nearby objects clearly, but has no problems in seeing distant objects.
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About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people?
Name the defect of vision in a person:
whose far point is less than infinity
Which defect of vision can be rectified:
by using a convex lens?
Name one defect of vision (or eye) which cannot be corrected by any type of spectacle lenses.
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(i) a distance of 20 cm?
(ii) at infinity?
An old man cannot see objects closer than 1 m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the (i) defect of vision and also (ii) for its correction.
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Mention, if the following statement is True or False
Hypermetropia is a defect of the eye caused due to the eyeball elongation
Write scientific reason.
Nearsightedness, this defect can be corrected by using spectacles with concave lens.
Observe the figure whether it is correct or not and explain the phenomenon.
