What happens after refraction, when :
(i) 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 ?
(i) When a ray of light parallel to the principal axis passes through a concave lens is shown below
(ii) When a ray of light falls on a convex lens while passing through its principal focus is shown below
(iii) When a ray of light passes through the optical centre of a convex lens is shown below,