homework (C and E)

Review the material on:

Critical angle
Total internal reflection
Snell's law and how to get angles using the 2nd SIN function (inverse sine) on your calculator.

Also, answer these questions:

1. Calculate the critical angle for water (n = 1.33).

2. Determine the index of refraction of a substance with critical angle 50 degrees.

3. If you were trying to hit a fish with a spear (like in the movie, "Castaway"), should you aim above, below or at the fish in the water?

4. If you were trying to hit the fish in the previous problem with a laser, would your answer change? How so?

5. If the cosine of an angle is 0.4, what is the value of that angle?