You must have seen some people holding books very close to their eyes. This is because they suffering from myopia (short sightedness). A myopic person cannot see distant objects clearly because the far point of his eye is less than infinity.
Myopia is the defect of the eye due to which the eye is not able to see the distant objects clearly.
Myopia is due to:
Normal Eye - The image is formed on the retina
Eye Ball Too Long
A myopic eye forms the image of a far off object in front of the retina because of the increase in converging power of the eye lens. Therefore myopia can be rectified by using a suitable divergent or concave lens.
Correction of myopia using a concave lens
