Question

a person is suffering from an eye defect use lenses of -1D to correct the defect.name the defect he is suffering from and the nature of the lens used to correct it

Answer 1

Defect=short sightedness(myopia)
nature of lens=concave lens or diverging lens.

this , you .

Answer 2

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

The eye defect the person suffering from is

myopia (nearsightedness).

To correct the defect, concave lens is used.

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

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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