1. OPTICS

2. WHAT DO YOU ALREADY KNOW?
What is the main source of energy for Earth?

3. The SUN The Sun is 1.50 X 10^8 km from Earth
The tiny amount of light that reaches Earth is able to provide enough energy to heat Earth’s surface and allow photosynthesis to occur

4. DID YOU KNOW?? A PHOTON is a small packet of light
Photon is the Greek word for “light”

5. Optics Intro ACTIVITY #1 What is LIGHT? How do we see LIGHT?
Invisible Light – using a laser or strong flashlight and a water spray bottle (Refer to Seeing is Believing handout)

6. Light travels in straight lines
We can see the light reflected on the wall because the light is reflecting from it.
Light is reflected from the water droplets so we can see it.

8. ACTIVITY #2: Images Hold your hand just above a sheet of paper
What happens to the shadow as you move your hand closer to the paper?
How does the shadow change as you move your hand farther away from the paper? Why does this happen?

9. ACTIVITY #3: Mirrors
On the paper provided, draw a picture or write down a few words.
Look at your image in a plane mirror
How does the writing appear when you look at it the in a mirror?

10. How is the writing on this ambulance similar to what you saw looking at your image in the mirror?

11. Definitions to know
MEDIUM: any physical substance through which energy can be transferred
RADIATION: a method of energy transfer that does not need a medium
ELECTROMAGNETIC WAVE: a wave that has both electric and magnetic parts

12. Light can travel through the vacuum of outer space
In 1801, Thomas Young demonstrated that light has wave-like properties
In 1864, James Clerk Maxwell predicted that electromagnetic waves do not need a medium

13. DEFINITIONS CON’TD
VISIBLE LIGHT: electromagnetic waves that the human eye can detect
ELECTROMAGNETIC SPECTRUM: the classification of electromagnetic waves by energy

16. VIEWING THE VISUAL SPECTRUM

18. In a vacuum, each colour travels at the same speed: the speed of light
Each colour travels at a different speed
RED light is the least energetic and slowed the most
VIOLET light is the most energetic and slowed the least

19. ROY G. BIV
Red
Orange
Yellow
Green
Blue
Indigo
Violet

20. ACTIVITY #4: COLOUR THEORY
Take either a Red or Blue Filter
Read the next slide as you hold the filter in front of your eyes
Record your answer on your worksheet

21. Why did the chicken cross the road?
To get to the other side.
To run away from the dinner table.

22. QUICK DEMOS
Have a look at both surfaces of a spoon (What do you notice about the images produced?)
Why does a pencil bend when you look at it through the water in the beaker?

23. HOMEWORK
Answer pg 469 Q #1, 5, 9, 10

24. OPTICS UNIT OVERVIEW How light is produced Ray Model of Light
Reflection
Images in a Plane Mirrors
Images in Curved Mirrors
Refraction
Path of Light through different medium
Total Internal Reflection
Optical Illusions
Lenses
Lens Application: Cameras, Microscopes etc
The Human EYE