Draw ray diagram in each of the following cases to show what happens after reflection to the incident ray when
(a) it is parallel to the principal axis and falling on a concave mirror.
(b) it is falling on a concave mirror while passing through its principal focus.
(c) it is coming oblique to the principal axis and falling on the pole of a convex mirror.
(b) When Incident ray is passes through the principal focus and falls on a concave mirror, the ray reflects parallel to the principal axis.
(c) When incident ray is coming obliquely to the principal axis and falls on the pole of a convex mirror, the ray reflects back at the same angle as the angle of incidence, following the law of reflection.