a.


8. What happened to the light when it was blocked with a thick cardboard?
a. The light was automatically turned off
b. The light still able to pass through the cardboard.
c. The light was not able to pass through the cardboard.
d. The light bent and finds its way to pass through the other board.
9. It is a narrow but powerful beam of light that can travel long distances.
a. flashlight b. laser c. optical fibers d. fluorescent bulb
10. What do you call
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