Question

Name the type of defect of vision a person is suffering if he uses convex lens in his spectacles for the correction of the vision . If the power of the lens is 2.59 find the focal length of the lens

Answer 1

Answer:

if he uses convex lens he is suffering from myopia

P=2.59D

1/f=2.59D

f=100/259

f=0.386m

f=38.6m

Answer 2

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

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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