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4. Which of the following is the best example of diffraction?
a. Your voice echoing back when you shout into a canyon
b. A straw appearing to bend when you place it in a glass of water
C. A prism breaking a beam of light into its component colors
d. The music on your stereo getting louder when you turn up the volume

5. What is the main difference between refraction and diffraction?
a. Refraction is a phenomenon that affects light; diffraction is a phenomenon that affects
sound.
b. Refraction involves the bending of light; diffraction involves the bending and spreading
of light, usually around an obstacle.
c. Refraction usually happens in the atmosphere; diffraction usually happens closer to the
earth's surface.
d. Refraction involves changes to the density of light; diffraction involves changes to the
speed of light.