First slide

Nature of electromagnetic wave

Question

For a transparent medium relative permeability and permittivity, $μ_{r} and \in_{r}$ are 1.0 and 1.44 respectively. The velocity of light in this medium would be,

Moderate

Solution

$\frac{C}{v} = \sqrt{μ_{r} \in_{r}} v = \frac{C}{\sqrt{μ_{r} \in_{r}}} = \frac{3 \times 10^{8}}{\sqrt{1.44}} = 2.5 \times 10^{8} m / s$

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