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Consider a configuration of n identical ...

Consider a configuration of n identical units , each consisting of three layers . The first layer is a column of air of height `h = 1/3` cm , and the second and third layers are of equal thickness d = `(sqrt(3)-1)/2 cm` , and the refractive indices `mu_(1) = sqrt(3/2) and mu_(2) = sqrt(3)` , respectively . A light source O is placed on the top of the first unit , as shown in the figure .A ray of light from O is incident on the second layer of the first unit at an angle of `theta = 60^(@)` to the normal . For a specific value of n , the ray of light emerges from the bottom of the configuration at a distance `l = 8/sqrt(3)` cm , as shown in the figure . The values of n is ___.

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