1. Aim: How do we describe the critical angle for a medium?
HW:

2. Activity
Go to the station you are assigned in the room and solve for the angle described using Snell’s Law!

3. Use Snell’s Law to identify the angle of refraction in ALL mediums and the angle of reflection at the mirror base.

4. What is the difference? Example: Fiber Optic Cables
Critical Angle: Smallest angle of Incidence for which
light is totally reflected
The Critical Angle occurs when the refracted angle is
90 degrees.
Example: Fiber Optic Cables

5. Dispersion The separating of a light ray into its colors
Caused by the refraction of light
Each color has a slightly different index of refraction which means that each color bends a little more than the last causing a rainbow

6. Critical angle of a waterfall

7. Practice
What is the critical angle for a light ray traveling from corn oil into diamond?
What occurs when light hits the diamond at an angle greater than the critical angle?

8. Exit Card
Use your knowledge of friction to answer the questions on your exit card. Be sure to hand in your exit card when it is complete.

9. What are the three main formulas regarding refraction?
Explain what each formulas describes.
Describe the critical angle!

10. Critical Angle Lab Goals:
To use Snell’s Law and the ideas of refraction to determine the critical angle of water.
To verify the law of reflection