The electric field of an electromagnetic wave travelling through a medium is given by 
then the refractive index of the medium is 
.
(All given measurement are in SI units)
Text Solution
Verified by ExpertsThe correct answer is:
A
The electric field is 
.
This is in the standard form 
where angular frequency 
and wave number 
.
The speed of the wave in the medium is 
.
The refractive index is defined as 
where 
is the speed of light in vacuum.
Therefore, 
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