When light is incident normally on the interface between two transparent optical

Question

When light is incident normally on the interface between two transparent optical media, the intensity of the reflected light relative to that of the incident light is given by the expression below, in which S represents the average magnitude of the Poynting vector in the incident light (the incident intensity), S' is the reflected intensity, and n1 and n2 are the refractive indices of the two media.

(a) What fraction of the incident intensity is reflected for 535 nm light normally incident on an interface between ethyl alcohol and polystyrene?

Explanation / Answer

refractive index for ethyl alcohol n1 = 1.361
Refractive index for polysterene n2 = 1.55
Now fraction is = (n2 - n1  / n2 +n1)2 = 0.004

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