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The speed of light in vacuum is $3\times 10^8 m/s$. The refractive index of material x is 1.8. The speed of light in material x would be |
$1.8\times 10^8 m/s$ $1.67\times 10^8 m/s$ $2\times 10^8 m/s$ $5.4\times 10^8 m/s$ |
$1.67\times 10^8 m/s$ |
$\text{The speed of light in material x is }v = \frac{c}{\mu} = \frac{3\times 10^8}{1.8} = 1.67\times 10^8m/s$ |
