1.

To correct myopia why we use concave lens and to correct hypermetropia, why do we use convex lens? Why can’t we do vice-versa?

Answer»

Myopia is a defect in which the image is formed in front of retina. We need to use diverging lens so that it can further diverge the light rays before it enters our eye and make it possible to meet on the retina. 

In case of hypermetropia, the image is formed beyond retina, we need to use convex lens so as to converge the rays and make it possible for the rays to meets on the retina.



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