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Question

A rays of light passes through four transparent media with refractive indices μ1,μ2,μ3andμ4 as shown in the Figure 28.79. The surface of all media are parallel. if the ray CD is parallel to the incident ray AB. We must have

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A
μ1=μ2
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B
μ2=μ3
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C
μ3=μ4
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D
μ4=μ1
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Solution

The correct option is D μ4=μ1
for any number of mediums , if α1 is angle of incidence at 1st interface and αn is angle of refraction at some nth interface then ,

μ1μn=sinαnsinα1

here the two rays are parallel hence the refractive index of both the medium are same . hence option D is correct

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