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  •  A ray of light passes through four transparent media with refractive indices μ1, μ2, μ3 and μ4n

 A ray of light passes through four transparent media with refractive indices μ1, μ2, μ3 and μ4  as shown in the figure. 

                                                                           

The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

Option: 1

μ1=μ2


Option: 2

μ2=μ3


Option: 3

μ3=μ4


Option: 4

μ4=μ1


Answers (1)

best_answer

\begin{array}{l}{\text { Applying Snell's law }(\mu \sin i=\text { constant }) \text { at } B \text { and } C,} \\ {\mu_{1} \sin i_{B}=\mu_{4} \sin i_{C}} \\ {\text { Given, } A B|| C D} \\ {i_{B}=i_{C}} \\ {\mu_{1}=\mu_{4}} \\ {\text { The correct answer is: } \mu_{4}=\mu_{1}}\end{array}

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