Question: When light is incident normally on the interface between two transparent optical media, the intensity of the reflected light is given by the expression In

When light is incident normally on the interface between two transparent optical media, the intensity of the reflected light is given by the expression In this equation S1 represents the average magnitude of the Poynting vector in the incident light (the incident intensity), S+1 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 589-nm light normally incident on an interface between air and crown glass?
(b) What If? Does it matter in part (a) whether the light is in the air or in the glass as it strikes the interface?

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