Published by:
CGP EDU Academic Team
Published on: August 23, 2026
SECTION - B
In a medium the speed of light wave decreases to 0.2 times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is 
. The value of 
is (Given speed of light in free space 
and for the given medium 
)
Text Solution
Verified by ExpertsThe correct answer is:
5
(5) 
refractive index
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