Compute the refractive index when the dielectric constant is 256 in air.

A)
16
B)
64
C)
256
D)
2562

Correct Answer : Option (A) :   16

Explanation : By Maxwell relation, εr = n2, where εro is the dielectric constant at optical frequencies and n is the refractive index.For the given dielectric constant we get n = 16.

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