USES OF LENSES

(A) CONCAVE LENS : 

1-) Concave lens are used in a variety of instruments e.g., microscope,telescope,photographic camera, film projector etc. 

2-) To view the smallest parts of watch by watch maker. 

3-) To detect eye and ear defects by a doctor. 

4-) To remove the defect of hypermetropia.

(B) CONVEX LENS :

1-) In the construction of Gallileo's telescope.

2-) To remove the defect of myopia.