1. Light and Applications of Optics

2. Unit at a Glance (p272) (don't copy)
What is light and how is it produced?
How does light interact with objects to give them colour?
How can you mix colours to make different colours?
What is the law of reflection and how do mirrors form images?
What is refraction and how can it be used?
What are lenses and what are some of their applications?
try the "Get Ready" questions
on p.274

3. Producing Light (p.278)
Luminous Non-luminous
( ) ( )

4. Producing Light (p.278) Luminous Non-luminous
(produce light) (reflect light)
e.g e.g.

5. Producing Light (p.278) Luminous Non-luminous
(produce light) (reflect light)
e.g e.g.
sun moon
lightbulb
you

6. Ways of Producing Light
Incandescence (burning, bulbs)
Fluorescence (CFLs)
Phosphorescence
Chemiluminescence
Bioluminescence
Triboluminescence
Light Emitting Diodes (LEDs)
Electric Discharge

7. Incandescence
- so hot it glows!
3min
how it's made 5 min
1min

8. Fluorescence (CFLs)
- release light when hit by UV rays
1.5 min
8min

9. Phosphorescence "glow in the dark"
- glows after hit by radiation (light)
22 sec

10. Chemiluminescence - light released during a chemical reaction 3min
elephant toothpaste 1min

11. Bioluminescence
- living chemiluminescence
13 sec
2min
3min

12. Tribouminescence
Light from rubbing, scratching or similar friction

13. Electric Discharge - a gas emits light when electrons pass through
4min
8min

14. LED Light Emitting Diode/Device
an LED produces light when electrons move around within its semiconductor structure
Electroluminescence