Myopia is an eye-defect in which a person is unable to see the distant object but can see clearly the nearby objects.
The various causes of myopia are:
1. It is caused due to elongation of eye ball
2. It is caused due to decrease in the focal length of eye lens.
Myopia can be corrected by usage of a concave lens of suitable power.
The Ray diagram which shows the Myopic correction is:
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