'Back around 100 A.D. Ptolemy studied the refraction of this through several media'
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PHYSICS: Back around 100 A.D. Ptolemy studied the refraction of this through several media
Back around 100 A.D. Ptolemy studied the refraction of this through several media
Back around 100 A.D. Ptolemy studied the refraction of this through several media
PHYSICS
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PHYSICS