Question

Explain with the help of labelled ray-diagram, the defect of vision called hypermetropia, and how it is corrected by a lens.

Answer 1

Answer:

A defect due to which a person can see distant objects clearly but cannot see nearby objects distinctly is called hypermetropia or far sightedness.

It is corrected by convex mirror of appropriate focal length or power

Explanation:

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Answer 2

The defect of vision called hypermetropia, and how it is corrected by a lens are discussed below

Explanation:

• The medical term for long-sightedness is hypermetropia. It is a vision defect because of which a person will not be able to see the nearby objects but can see distant objects.
• This defect in eye can be adjusted using the convex lens. The below diagram shows the hypermetropic eye and its correction.
• In a hypermetropic eye, the image of nearby object lying at normal near point N (at 25 cm) is formed behind the retina.
• The near point N' of hypermetropic eye is farther away from the normal near point N.
• Corrections 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.