Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle has n2 and the bottom one has n3 . If n1 < n2 < n3, at what angle of incidence will a ray of light traverse the three layers in a single straight line?
a. ?i = sin–1(1/n1)
b. ?i = sin–1(1/(n1+n2+n3)
c. ?i = tan–1(1/(n1+n2+n3)
d. There is such an angle, but it is not given.
d
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