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The electric field of a light wave traveling in the Z-positive direction in a medium is given by $(E_{x} = E_{o} \sin (a t - Z / b)$ , where z distance and t is time and a and b are constants. If the speed of light in vacuum is c, then the refractive index of the medium is

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$c \sqrt{a b}$

$b c / a$

$c / a b$

$a c / b$

answer is C.

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Detailed Solution

$v = \frac{a}{(1 / b)}, μ = \frac{c}{v}$

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