THE SPEED OF LIGHT IN DIAMOND IS 2/5 OF ITS SPEED IN AIR. THE REFRACTIVE INDEX OF DIAMOND IS....
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refrective index of diamond= speed of light in air / speed of light in diamond, here speed of air (C) = 3×10^8 m/sec, and speed of light in diamond = (2/5)×C ,. refrective index = C/(2C/5),. refrective index= 5/2 = 2.5
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