The electric field of a plane electromagnetic wave, travelling in an unknown nonmagnetic medium is given by, 
(where 
and other values have S.I. units). The dielectric constant of the medium is 
(speed of light in free space is 
)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(4)
From the wave equation 
:
Wave number: 
Angular frequency: 
Speed of wave in medium: 
Speed of light in vacuum: 
Refractive index: 
For a nonmagnetic medium: 
Dielectric constant: 
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