What is short-sightedness ? State the two causes of short-sightedness (or myopia). With the help of ray diagrams, show:
(i) the eye-defect short-sightedness.
(ii) correction of short-sightedness by using a lens.
The defect of vision due to which a person can see nearby objects clearly but cannot see distant objects clearly is known as short-sightedness.
The two of its causes are :-
1) Excessive curvature of the eye lens
2) Elongation of the eyeball.
Its ray diagram can be shown as :-
(ii) The 3rd diagram shows the correction of short-sightedness by using a lens.