Question

22.
What happens after refraction, when :
(1) a ray of light parallel to the principal axis passes through a concave
lens ?
(ii) a ray of light falls on a convex lens while passing through its
principal focus ?
(iii) a ray of light passes through the optical centre of a convex lens ?​

Answer 1

1) it will go through the focus pound which we would assume .

2) it will get parallel to principal axix .

3) it will go straight