How to Prove That Light Travels in a Straight Path1
How to Prove That Light Travels in a Straight Path
Gather your materials.
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Punch a hole in the center of the index cards.
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Use the modeling clay to stand up the cards.
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Position the flashlight or the laser pointer at one end of the row of cards.
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Move the flashlight or laser pointer so it does not hit the center of the first card.
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