A reflected ray is the ray that 'bounces off' the boundary between two optical media (but never use that term in an exam - always say 'reflects').

It is formed according to the Law of Reflection... see the diagram below...

The angle of incidence is the angle between the normal and the incident ray.

The angle of reflection is the angle between the normal and the reflected ray.

The Law of reflection states that the angle of incidence equals the angle of reflection. The incident ray and the reflected ray and the normal are all in the same plane.

The formation of an image in a plane mirror

The vidclip below will lead you through how to draw a ray diagram of the reflection of a point object in a plane mirror - a frequent subject set in GCSE examination questions....

This vidclip takes you through how to construct a ray diagram to illustrate the nature the image in a plane mirror - that it is virtual, ertect, laterally inverted and that each image point is formed as far behind the mirror as the corresponding object point is in front.  

Concave mirrors

Convex Mirrors

Now revise the topic from flash cards I have written for: