The refractive index of diamond and rock salt are 2.42 and 1.54 respectively. if the speed of light in diamond is 1.2*10^8 m/s, find the speed of light in rock salt
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Answer is : 1.885 * 10^8 m/s
Refractive index of a medium (r)
= speed of light in air or vacuum (c) / speed of light in that medium (v)
i.e. r = c/v
r*v = c
As speed of light in vacuum is always c,
therefore r1 * v1 = r2 * v2
2.42 * 1.2 * 10^8 = 1.54 * v2
=> v2 = 1.885 * 10^8 m/s
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