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प्रश्न
The eye defect ‘presbyopia’ can be corrected by
विकल्प
convex lens
concave lens
convex mirror
Bifocal lenses
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उत्तर
Bifocal lenses
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संबंधित प्रश्न
A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision and (ii) near vision?
Anuja’s father cannot see nearby objects clearly.
(a) What is the eye defect he is suffering from?
(b) How is it corrected?
Bifocal lens is required to correct _______ defect.
Write the name.
The defect of eye occurring due to ageing
Write scientific reason.
Presbyopia effect is more common in people over 40 years of age.
Distinguish between:
Myopia - Presbyopia
Complete the correlation:
Farsightedness : Convex lens : : Presbyopia : ______
Write a short note on Presbyopia.
