Question

what is myopia and hypermetropia .state the two cause of both ?with the help of ray diagram show eye defect and correction of both defects​

Answer 1

Explanation:

In myopia distant objects are not clearly visible.The far point for a myopic eye is much nearer than infinity.

cause. 1 . due to the elongation of eyeball.

cause.2. due to decrease in the focal length of the eye lens

Hypermetropia nearly objects are not clearly visible.Near point is at a distance greater than 25 cm and hence image of near object is formed behind the retina

cause.1.Low converging power of eye lens becoz of weak action of ciliary muscle .

cause.2.abnormal shape of the covex