A ray of light passes through four transparent media with refractive indices μ 1, μ 2, μ 3 & μ 4 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: 
Text Solution
Verified by ExpertsThe correct answer is:
D
Applying Snell’s law at B and C ,
µ sin i = constant or
µ 1 sin i B = µ 4 sub i C
But since AB | | CD
∴ i B = i C
or µ 1 = µ 4
The Snell’s law, which the students read in their plus two syllabus µ = 
comes
from µ sin i = constant
µ 1 = µ 1 sin i 1 = µ 2 sin i 2
µ 2 = µ or sin i = µ sin r
or ;k µ = 
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