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The Human Eye and Colourful World
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28/08/2021 6:35 pm
Topic starter
Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.
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28/08/2021 6:42 pm
Myopia or short sightedness is that defect of vision due to which a person cannot see the distance objects clearly (though he can see the nearby objects clearly). This eye defect can be corrected by using a concave lens.
Myopic eye and its correction is given in the following diagrams:
(a) In a hypermetropic eye, image of nearby object lying at normal near point N (at 25 cm) is formed behind the retina.
(b) The near point N' of a hypermetropic eye is farther away from the normal near point N.
(c) Correction of hypermetropia. The convex lens forms a virtual image of the object (lying at normal near point N) at the near point N' of this eye.