In which light produces image focus in front of the retina?

Question

Question

Answer 1

CONCEPT:

Myopia (short-sightedness):

It is a defect of the eye due to which a person can see a nearby object clearly but cannot see far away objects clearly.

EXPLANATION:

In this defect, the image is formed before the retina and far point comes closer. Therefore option 4 is correct.

In this defect focal length or radii of curvature of the lens is reduced or the power of the lens increases or the distance between the eye lens and retina increases i.e., the eyeball becomes too long.
This defect can be removed by using a concave lens of suitable focal length.

Defects of Vision	Details	Corrections
Hypermetropia or Farsightedness	The human eye can see distant objects clearly but cannot see nearby objects clearly.	Convex Lens
Presbyopia	In this defect, both near and far objects are not clearly visible. It is an old age disease and it is due to the losing power of accommodation.	Bifocal lenses
Astigmatism	In this defect, the eye cannot see horizontal and vertical lines clearly, simultaneously. It is due to the imperfect spherical nature of the eye lens.	Cylindrical lens