1. UNIT 2 Light and Applications of Optics

2. 4.0 Introduction Big Ideas (p274-275)Introduction (p274-275)

3. Copyright © 2010 McGraw-Hill Ryerson Ltd. Light is a form of energy, produced from a variety of sources. Describe all of the sources of light shown in the illustration below. Sources of Light

4. Copyright © 2010 McGraw-Hill Ryerson Ltd. What NATURAL sources of light are NOT shown in the illustration below? Sources of Light

5. Copyright © 2010 McGraw-Hill Ryerson Ltd. Reflection Objects can reflect light.

6. Copyright © 2010 McGraw-Hill Ryerson Ltd. Refraction Objects can refract light.

7. Copyright © 2010 McGraw-Hill Ryerson Ltd. Light Terms How does light behave when it hits a transparent surface? An opaque surface? A translucent surface?

8. Copyright © 2010 McGraw-Hill Ryerson Ltd. Mixing Colours The three colours pictured below (red, yellow, and blue) combine in different ways to make the range of colours shown in the bar. Which combinations make which colours?

9. Copyright © 2010 McGraw-Hill Ryerson Ltd. What’s Your Angle? Which of the lines pictured below: are parallel to each other? are perpendicular to each other? intersect each other?

10. Copyright © 2010 McGraw-Hill Ryerson Ltd. What instrument do you use to measure the size of an angle? Using the device show below, determine the size of angles a to h. What’s Your Angle?

11. 4.1 Production of Light (p 278-279) Production of Light (p 278-279)

12. Incandescence: Light given off when an object is very hot. Ex: stove burnerlight bulb

13. Luminescence: Light given off when an object is not heated. There are several types of luminescence:  Chemiluminescence – some chemical reactions emit light, but no heat.  Electric Discharge – gases in a tube absorb electrical energy and emit light.  Fluorescence - gases in a tube absorb electrical energy and emit ultraviolet light.

14. Chemiluminescence Electric Discharge Fluorescence Luminescence – 3 Types

15. Class Work (4.0) Get Ready! Complete - worksheet 4.0 (4.1) Production of Light Read - p 276 – 284 in your Textbook Complete - WB p113 *BRING an empty toilet paper or paper towel roll