Question

Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye.

Answer 1

A normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye. This is because the ciliary muscles of eyes are unable to contract beyond a certain limit. If the objects are placed at a distance less than 25 cm from the eye, then the objects appear blurred because light rays coming from the object meet beyond the retina.