Velocity of light is equal to

Relation for velocity of light $(c)=\sqrt{\frac{1}{\varepsilon_0 \mu_0}}$ (where $\varepsilon_0=$ permittivity constant equal to $8.85 \times 10^{-12} \mathrm{~F} / \mathrm{m}$ and $\mu_0=$ permeability constant equal to $1.26 \times 10^{-6} \mathrm{H} / \mathrm{m}$. Numerically velocity of light $(c)=\sqrt{\frac{1}{\varepsilon_0 \mu_0}}=\sqrt{\frac{1}{\left(8.85 \times 10^{-12}\right) \times\left(1.26 \times 10^{-6}\right)}} \approx$3 $\times$10^8 $\mathrm{~m}$/ $\mathrm{s} \text{. }$