Light is traveling in air at a speed of 300,000 km/s. Which substance would cause the light to refract the LEAST?
A.
ruby (speed of light = 170,000 km/s)
B.
glass (speed of light = 200,000 km/s)
C.
water (speed of light = 225,000 km/s)
D.
diamond (speed of light = 120,000 km/s)
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