Gently handle the spectacles of your grandparents and check the type of curvature in the lenses and record the observations about the vision through these lenses

 

Asked by bhardwajshan2 | 7th May, 2019, 10:16: AM

Expert Answer:

If the lens is thin at middle than at edges then the lens used is concave. The concave lens is used for correcting myopia.
If the lens is thick at middle than at edges then the lens used is convex lens. The convex lens is used for correcting hypermetropia. 

Answered by Shiwani Sawant | 7th May, 2019, 06:40: PM