If a ray of light enters from alcohol to air. The refractive index of alcohol is 1.36. Calculate the speed of light in alcohol with respect to air.
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Speed of light in vacuum $=3 \times 10^8 m / s$.
$\text { Refractive index }(\mu)=\frac{c \text { (speed of light in vaccum) }}{v \text { (speed of light in alcohol) }}$
$\Rightarrow 1.36=\frac{3 \times 10^8}{\text { speed of light in alcohol }}$
$\Rightarrow$ speed of light in alcohol $=\frac{3 \times 10^8}{1.36}$
$\therefore$ speed of light in alcohol $=2.21 \times 10^8 m / s$
speed of light in alcohol with respect to air is $2.21 \times 10^8 ms^{-1}$
$\text { Refractive index }(\mu)=\frac{c \text { (speed of light in vaccum) }}{v \text { (speed of light in alcohol) }}$
$\Rightarrow 1.36=\frac{3 \times 10^8}{\text { speed of light in alcohol }}$
$\Rightarrow$ speed of light in alcohol $=\frac{3 \times 10^8}{1.36}$
$\therefore$ speed of light in alcohol $=2.21 \times 10^8 m / s$
speed of light in alcohol with respect to air is $2.21 \times 10^8 ms^{-1}$
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