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प्रश्न
What type of lens is used to correct Astigmatism?
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उत्तर
Cylindrical lens
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संबंधित प्रश्न
The kind of lens required to correct Myopia
Name the defect of vision in a person:
whose near point is more than 25 on away.
What is the far point of a person suffering from myopia (or short-sightedness)?
The near-point of a person suffering from hypermetropia is at 50 cm from his eye. What is the nature and power of the lens needed to correct this defect? (Assume that the near-point of the normal eye is 25 cm).
The defect of vision which cannot be corrected by using spectacles is:
(a) myopia
(b) presbyopia
(c) cataract
(d) hypermetropia
Though a woman can see the distant object clearly, she cannot see the nearby objects clearly. She is suffering from the defect of vision called:
(a) long-sight
(b) short-sight
(c) hind-sight
(d) mid-sight
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?
Write whether the following is true or false:
A convex lens is used for correcting myopia.
Give Reason:
Older people require glasses to read and write.
Myopia and hypermetropia can be corrected by:
