A ray of light travelling in air is incident on the plane surface of a transparent medium. The angle of incidence is `45^@` and the angle of refraction is `30^@` . Find the refractive index of the medium .

Explanation

Here, `i=45^@ ,r =30^@`
`n=("sin"i)/("sin"r)=("sin" 45^@)/("sin"30^@)=(1/(sqrt 2)/(1/2)= sqrt2`.