Question

If the refractive index of alcohol is 1.36, what wille be the speed of light in it? ​

Answer 1

Answer :

Refractive index of alcohol = 1.36

We have to find speed of light in alcohol$.$

★ Refractive Index :

• Refractive index of a medium is defined as the factor by which speed of light reduces as compared to the speed of light in vacuum.
• More (less) refractive index implies less (more) speed of light in that medium, which therefore is called denser (rarer) medium.

$\dag\:\boxed{\bf{n=\dfrac{c}{v}=\dfrac{speed\:of\:light\:in\:vacuum}{speed\:of\:light\:in\:medium}}}$

• Refractive index of a medium is an unitless as well as dimensionless quantity.

➝ n = c / v

➝ 1.36 = 3 × 10⁸ / v

➝ v = 3/1.36 × 10⁸

➝ v = 2.2 × 10⁸ m/s