A ray of light passes through four transparent media with refractive indices 
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
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
For successive refraction through different media 
constant. Here as 
is same in the two extreme media, 
.
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