Speed of light in lucite is found by c/n, c being the speed of light in a vacuum, n being the index of refraction of lucite (1.5)

(3 x 10^8)/(1.5) = 2 x 10^8

(3 x 10^8)/(1.5) = 2 x 10^8

(3 x 10^8)/(1.5) = 2 x 10^8

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