|  | 3.2 |
| Optical Media
|  | 3.2.3 |
| Reflection
When a ray of light (the incident ray) strikes the shiny surface of a flat piece of glass, some of the light energy in the ray is reflected. The angle between the incident ray and a line perpendicular to the surface of the glass at the point where the incident ray strikes the glass is called the angle of incidence. The perpendicular line is called the normal. It is not a light ray but a tool to allow the measurement of angles. The angle between the reflected ray and the normal is called the angle of reflection. The Law of Reflection states that the angle of reflection of a light ray is equal to the angle of incidence. In other words, the angle at which a light ray strikes a reflective surface determines the angle that the ray will reflect off the surface.
|  | Interactive Media Activity
Interactivity: Law of Reflection This activity animates how angles affect reflection. Interactive Media Activity 3.2.3 is located in the CCNA 3.0 Bridge 1 Activities and Quizzes file. The Activities and Quizzes file can be downloaded in the Course Material section of your class homepage.
Web Links
he Transmission of Wave through Dense media – Reflection and Refraction http://www.phy.ntnu.edu.tw/java/ propagation/ propagation.html