Question

a person is advised to wear spectacles with concave lenses. what is the name of the defect?

Answer 1

Myopia

Near-sightedness : A person with Myopia can see nearby objects clearly

A person with myopia cannot see faraway objects clearly.

The far point for the myopic eye is nearer than infinity

Occurs due to

Excessive curvature of the eye lens

Elongation of eyeball

The image of a distance object is formed in front of the retina and not on the retina

Defected is corrected by using Concave lenses such that the lens will bring the image back on to the retina.

Answer 2

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

The person who is advised to wear spectacles of concave lenses is suffering from eye defect of

myopia (nearsightedness).

$\large\boxed{\fcolorbox{blue}{yellow} {Explanation }}$

1. A person suffering from myopia can say e nearby objects clearly as the image of a nearby object is formed on the retina, but cannot see distant objects clearly as the image of a distant object is formed in front of the retina instead of on the retina.

2. A concave lens diverges the rays of light passing through it.

3. When spectacles of concave lens of appropriate power are used, the parallel rays coming from a distant object are diverged to proper extent before they are incident on the eye lens.

Therefore, after the converging action of the eye lens, the image of a distant object is formed on the retina of the eye and hence the distant object can be seen clearly.

Hope it helps!

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