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11 Answer:
Light whose waves vibrate along a single plane is called _____.
12 Answer:
A mirror with a surface that curves outward, like that of a ball
is said to be _____.
13 Answer:
The distance between the center of a mirror and the focal point is
called the _____.
14 Answer:
A glass or plastic object with at least one curved surface that is
used to spread out light rays is called a (an) _____.
15 Answer:
_____ are replacing electric wires in communications systems such
as telephone systems.