Geometrical OpticsHard

Question

A ray of light passes through four transparent media with refrective 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
     

Options

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

Solution

       
Applying Snell′s law at B and C,
    μ sin i = constant
    μ1 sin iB = μ4 sin iC
But AB || CD
∴     iB = iC
or     μ1 = μ4

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