Rays for Image Formation in Reflection

(i) A ray parallel to the Principal Axis, after reflection, will pass through the Principal Focus in case of a Concave Mirror or appear to diverge from the Principal Focus in case of a Convex Mirror.

(ii) A ray passing through the Principal Focus of a Concave Mirror or a ray which is directed towards the Principal Focus of a Convex Mirror, after reflection, will emerge parallel to the Principal Axis.

(iii) A ray passing through the Centre Of Curvature of a Concave Mirror or directed in the direction of the Centre Of Curvature of a Convex Mirror, after reflection, is reflected back along the same path.

(iv) A ray incident obliquely to the Principal Axis towards a point P on the Concave Mirror or a Convex Mirror, is reflected obliquely.

Any 2 of these rays can be used to draw Ray Diagrams and the point of intersection of the rays indicates the position of the image of the object.

Note:- All these rays follow the Law Of Reflection i.e. the Angle Of Incidence and the Angle of Reflection in all these cases will be equal.