We know, c=μ0ϵ01
for any medium
v=μϵ1 but μ=μrμ0 and ϵ=ϵrϵ0
∴v=μrμ0ϵrϵ01
=μrϵr1×μ0ϵ01=μrϵrc
NEET UG 2022 — Physics Electromagnetism
When light propagates through a material medium of relative permittivity ϵr and relative permeability μr, the velocity of light, v is given by : (c - velocity of light in vacuum)
Held on 30 Apr 2022 · Verified 9 Jul 2026.
v=ϵrμr
v=μrϵτ
v=ϵrμrc
v=c
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