For a medium with permittivity (ε) and permeability (μ), the speed of light (v) is given by:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $v=\sqrt{\frac{1}{με}}$
The speed of a light in a given medium with permitivity (ε) and permeability (μ) is -
$v=\frac{1}{\sqrt{εμ}}$
$∴c=\frac{1}{\sqrt{ε_0μ_0}}≃3×10^8m/s$