1. An Introduction to Reflection
SNC2D

2. We Reflect Light
None of us generates light in the visible region of the electromagnetic spectrum. We are not sources of light like the sun; rather, we are illuminated objects like the moon.
We make our presence visibly known by reflecting light to the eyes of those who look our way.

3. We Observe Reflected Light
These light rays travel in straight lines.

4. We Observe Reflected Light
In order for us to observe light, it has to be directed to our eyes. Light moving away from us cannot be seen unless it is reflected back.

5. The Law of Reflection
When light reflects off a surface, the angle of incidence is equal to the angle of reflection as measured from the normal.

6. The Law of Reflection
When light reflects off a surface, the angle of incidence is equal to the angle of reflection as measured from the normal.
The Law of Reflection is always observed
regardless of the orientation of the surface

7. Regular Reflection
A smooth surface will produce regular or specular reflection.

8. Diffuse Reflection
A rough surface (such as ourselves) will produce diffuse reflection because each small part of the surface makes a different angle with the incident light.

9. Other Options
Remember that light may also be absorbed by a surface (heating it up) or transmitted by the material.
We will discuss transmission more when we discuss refraction.