Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle n2 and the bottom one n3 . If n1 > n2 > n3, and a ray of light in air strikes the top layer, at which surface given can total internal reflection occur first?
a. the top surface
b. the surface between materials with indices n1 and n2
c. the surface between materials with indices n2 and n3
d. Total internal reflection cannot occur at any of these surfaces.
b
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