1. First, a little video...

2. Light and Optics
SNC2P Physics

3. What is light?
Light is energy and travels as a wave

4. Properties of a Wave

5. Using the picture or your textbook, define these terms:
Wavelength:
Crest:
Trough:
Amplitude:

6. How is light produced?
Incandescence: Light is produced by a HOT object.
Example: Fire or light bulb in a lamp
Not very efficient because heat is produced!!
Luminescence: Light is produced without much heat.
Example: Glow stick (chemical reaction) or neon lights (fluorescence)
??What tricks can we use to remember what these terms mean??

7. Examples of Incandescent Light

8. Examples of Luminescence

9. Homework
Page 279 #2, 4