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Point the blade towards a bare, round, incandescent light bulb. Hold the blade so that you can find the reflection of the bulb in the blade. Now slowly move the blade slightly so you "walk" the reflection of the bulb down the blade from one end to the other. Watch the reflection of the round bulb as it moves down the blade- does the reflection stay round or does it distort in and out of round every 4-6 inches or so as you "move" the reflection down the blade?

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