Question

A person using only convex lens positive power lens must be suffering from

Answer 1

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

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.

Hope it helps!

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Answer 2

The person is suffering from HYPERMETROPIA.

Let's see an explaination for this :

• First of all, HYPERMETROPIA is also known as Far-Sightedness , because the patient doesn't experience any problems in seeing distant objects.

• This is due to reduction in net power of convergence of the eye.

• As a result, the light rays from nearby objects meet behind the retina and produce blurred images.

So, doctors prescribe CONVEX SPECTACLES (with positive power) so that:

• The eye (with spectacles) is able to converge the light rays at retina and produce sharp image.

$\star$ Refer to the attached diagram.