Question

A person suffering from an eye defect uses lenses of power 1D name the defect he is suffering from and the neture of lens used

Answer 1

Common Optical Defects in LensSystems (Aberrations) Microscopes and other optical instruments are commonly plagued by lens errors that distort the image by a variety of mechanisms associated with defects(commonly referred to as aberrations) resulting from the spherical geometry of lens surfaces.

Answer 2

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The person having a positive power lens is suffering from

hypermetropia (farsightedness).

The nature of the lens is

convex lens.

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

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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