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.
Given;
Refractive index of alcohol (μ) = 1.36.
Speed of light in vacuum = 3×108m/s.
Refractive index (μ) = 
⇒ 1.36 = 
⇒ 
.
∴ speed of light in alcohol = 2.21 × 108m/s
speed of light in alcohol with respect to air is 2.21 x 108 ms-1
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