A ray of light passes four transparent glass slabs having refractive indices 
and 
as shown in the figure. If the emergent ray CD is parallel to the incident ray AB, then
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Applying Snell's law at B and C,
sin i = constant or 
sini B = 
sub i c
But since A B||C D
or 
The Snell's law, which the students read in their plus two syllabus 
comes from 
sin i =constant
or 
or 
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