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Light The Match
Purpose:To show that parallel rays of light entering a parabolic mirror are focused on the focal point and vice-versa.
Procedure:Place the lamp at the focus of one mirror and insert a match in the holder attached to the other mirror. When the light is turned on the match will flame up in about 10 seconds.
Hints:Lining up both mirrors is crucial. The easiest way to accomplish this is to use the reflection in the mirror itself. For example, to make sure the match head is lined up properly, look beyond the match head at the reflection in the mirror. The match head should be centered in the image of the opposing reflector. Use the same method for lining up the other mirror.
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