Distinguish between myopia and hypermetropia. Draw diagrams to show how these defects can be corrected by using suitable lenses.

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Solution

Myopia Hypermetropia

A person suffering from this defect can only see the nearby objects clearly. The distant objects will appear blurred to him. A person suffering from this defect can only see the distant objects clearly, while the nearby objects will appear blurred to him.

The image of the distant object is formed before the retina. The image of the near object is formed behind the retina.

The far point is at finite distance. The far point is at infinity.

The near point is at 25 cm. The near point is beyond 25 cm.

It can be corrected using a concave lens. It can be corrected using a convex lens.

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What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can be corrected by using an appropriate lens.

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Myopia	Hypermetropia
A person suffering from this defect can only see the nearby objects clearly. The distant objects will appear blurred to him.	A person suffering from this defect can only see the distant objects clearly, while the nearby objects will appear blurred to him.
The image of the distant object is formed before the retina.	The image of the near object is formed behind the retina.
The far point is at finite distance.	The far point is at infinity.
The near point is at 25 cm.	The near point is beyond 25 cm.
It can be corrected using a concave lens.	It can be corrected using a convex lens.