Question

Why do old people wear spectacles having convex lenses

Answer 1

old people wear convex lens because they are suffering from hypermetropia it is common in aged people because the adjusting power of their eye lens is decreases hence they are not adjust their lens too see nearby objects. to correct this problem they wear convex lens.
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Answer 2

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The person using spectacles of convex lenses is suffering from

hypermetropia (farsightedness).

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

1. A person suffering from hypermetropja can see distant objects clearly as the image of a distant object is formed on the retina, but cannot see nearby objects clearly as the image of a nearby object would be formed behind the retina instead of on the retina.

2. A convex lens converges the rays of light passing through it.

3. When spectacles of convex lenses of appropriate power are used, the rays of light coming from a nearby object are converged to proper extent before they are incident on the eye lens.

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

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