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Answer 1

Answer :

Myopia is the defect vision in which a human eye can see nearby objects distinctly but is unable to see distant object clearly as they appear indistinct.

In this case the image of a distant object is formed in front of the retina instead of on the retina.

Possible reasons of myopia:

1 ) The curvature of the cornea and the eye lens increases .The muscles near the lens cannot relax so that the converging power of the lens remains large.

2 ) The distance between the eye lens and the retina increases as the eyeball elongates.

Myopia is corrected using a suitable concave lens. Light rays are diverged by the concave lens before they strike the eye lens. A concave lens of proper focal length is chosen to produce the converging action of the eye lens, the image is formed on the retina.

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