Answer the following questions to the best of your ability. In these Introductory
Exercises, getting the ''correct'' answer is not important. Thinking through
the concepts and identifying your preconceptions is very important. Once
you have answered the questions individually, you may want to compare ideas
with one or two of your classmates. Were their answers the same or different?
How fast does light travel? Does it always travel at that speed?
Take a clear container of water and a straw or a pencil. Put the straw
(pencil) halfway in the water with the submerged end against the side of
the container and the unsubmerged end against the opposite side of the
container (see figure).
Does the straw (pencil) look straight? Why or why not?
Think about lenses, such as those used in eyeglasses or contact lenses.
How do they work? Discuss your ideas with your classmates. Does anyone
have differing ideas?
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