A boy uses spectacles of focal length -50 cm. Name the defect of vision he has.

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Solution

The boy has myopia or short-sightedness.

It can be corrected by using a divergent lens (with a negative focal length).

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Man A has a defect of vision due to which he cannot see the nearby objects clearly (through he can see the distant objects clearly). On the other hand, man B has a defect of vision due to which he cannot see the distant objects clearly (though he can see the nearby objects clearly). The defect in man A can be corrected by using spectacles containing lenses C whereas the defect in man B can be corrected by using spectacles containing lenses D.
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A boy uses spectacles of focal length -50 cm. Name the defect of vision he has.

The boy has myopia or short-sightedness. It can be corrected by using a divergent lens (with a negative focal length).

The boy has myopia or short-sightedness.

It can be corrected by using a divergent lens (with a negative focal length).