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For a transparent medium relative permeability and permittivity, $\mu_r$ and $\varepsilon_r$ are 1.0 and 1.44 respectively. The velocity of light in this medium would be,
Detailed Solution
$v=\frac{c}{\sqrt{\mu_r\varepsilon_r}}=\frac{3\times10^8}{\sqrt{1.44}}=2.5\times10^8$ m/s.