Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens.

Myopia is also known as short-sightedness in which the person finds difficulty in seeing objects that are placed nearby. This defect is corrected by using a diverging lens (concave lens). Following is the ray diagram of the correction of myopia:

(a) The image is formed in front of the eye.

(b) The far point of a myopic eye is less than infinity.

(c) Correction of myopia is done with the help of a diverging lens.