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# Light Interactions

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##### Description:

Students will learn about interactions of light. This includes: diffuse vs regular reflection, speed of light through different media and temperature effects, total internal reflection vs refraction, and polarization of light.

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### Developing Effective Teams

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Tutorial

## W: Watch and take notes- Interactions of Light

Be sure to pause, rewind, rewatch as necessary.

Source: various educators and langhans (powerpoints were meshed together from various resources)

## These are the “S” in WSQ. You must have them under your video notes completed by the due date on the Unit Plan.

1. Do you expect diffuse reflection, or regular reflection, from these surfaces?

a) a shiny metal surface ________________

b) plywood ______________

c) still, clear water ___________

d) clean, waxed linoleum floor___________

e) dirt _____________________

2. Can light travel in a vacuum? _____. Explain why or why not.

3.Label the following terms on the diagram below: - incidence ray - refracted ray - boundary - normal line - angle of incidence - angle of refraction - reflected ray

4. If a ray of light passes across the boundary from a material in which it travels fast into a material in which travels slower, then the light ray will bend _________ the normal line.

5. If a ray of light passes across the boundary from a material in which it travels slow into a material in which travels faster, then the light ray will bend ___________ the normal line.

6. If light travels into and out of a medium, it is possible that the final direction of the light waves is the same as the initial direction of the light waves. What are the two conditions necessary for this to occur? Include a labeled diagram to illustrate this occurrence.

7. Total internal reflection occurs when all the light is __________and none of the light is ___________ .

8. What are the two conditions necessary for total internal reflection to occur?

9. Define critical angle.

10. Define polarization.

11. When is it best to use a polarized filter?

Source: various educators and langhans

## HOT Question:

1. A question that you are still confused about (be specific, include which part of the video, etc)
2. A question that connects the videos together (i.e. asking about the relationship between the content)
3. A question you think you know the answer to, but you want to challenge your classmates with
Use your Unit Plan to help with question starters

Source: inspired by C. Kirch