This, then, is one of the important steps … list it in a table; then we try … table [of light refraction between air and water] was made in 140 A.D. [by Ptolemy], but it was not until 1621 that someone finally found … [Snell's law].
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Quote: Ptolemy produce a table for the refraction of light in 140 A.D., Snell found the law of refraction in 1621
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