Question

Bi-focal lens is used to correct ] A) Presbyopia B) Myopia C) Hypermetropia D) None Substance used for making surface smooth [ ] A) Plaster of Paris B) Bleaching powder C) Baking soda D) Washing soda​

Answer 1

Answer:

bi focal lens are used for both myopia and hypermetropia..2.plaster of paris

Answer 2

Answer:

Answer:

bi focal lens are used for both myopia and hypermetropia..2.plaster of paris