When light is incident normally on the interface between two transparent optical media, the intensity of the reflected light is given by the expression S = S, In this equation, S, represents the average magnitude of the Poynting vector in the incident light (the incident intensity), S; is the reflected intensity, and n, and n, 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) Does it matter in part (a) whether the light is in the air or in the glass as it strikes the interface?

College Physics
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Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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When light is incident normally on the interface between
two transparent optical media, the intensity of the reflected
light is given by the expression
S =
S,
In this equation, S, represents the average magnitude of the
Poynting vector in the incident light (the incident intensity),
S; is the reflected intensity, and n, and n, 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) Does it matter
in part (a) whether the light is in the air or in the glass as it
strikes the interface?
Transcribed Image Text:When light is incident normally on the interface between two transparent optical media, the intensity of the reflected light is given by the expression S = S, In this equation, S, represents the average magnitude of the Poynting vector in the incident light (the incident intensity), S; is the reflected intensity, and n, and n, 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) 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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