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Byju's Answer
Standard IX
Biology
Eye Diseases and Taking Care of Our Eyes
Name the kind...
Question
Name the kind of lens required to correct myopia.
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Solution
Myopia:
Myopia, also known as nearsightedness, arises when the eye loses its capacity to focus on distant objects due to the lenses' short focal length.
Nearby objects are plainly evident to patients with this impairment.
Short-sightedness is treated using a
concave lens
(myopia).
The
concave lens
spreads out the light rays so that they come together in sharp focus at the rear of the eye.
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Q.
(a) What is myopia?
(b) What are the causes of myopia?
(c) Draw three labelled ray-diagrams to show the defect of vision called myopia and how it is corrected by the use of lenses.
(d) The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the defect?