1. A ray of light leaves air (n = 1) and enters glass (n = 1.5). Once inside the glass, the light is at an angle of 30 relative to the normal. What angle did it enter the glass relative to the normal?

58.5 degrees

48.5 degrees

34.5 degrees

24.5 degrees

2. The sun emits white light, and yet we have all noticed that it looks a bit yellow/red when you see it from the earth, especially at sunset and sunrise. You may have also heard that the sky is blue. Explain these facts using the colors discussed in this lesson.

3. Water has the highest density in which phase?

Plasma

Liquid

Gas

Solid

4. Describe the image created by a convex lens when the object is located between the focal point F and two times the focal point F. Use the lens and magnification equations to support your answer.

5. A bi-metallic strip is a strip with two pieces of:

metal that expand the same amount when heated.

plastic that melt at different temperatures.

metal that expand by different amounts when heated.

aluminum that absorb heat efficiently.