A ray of light, after passing through a medium, meets the surface separating the medium from air at an angle of `45^(@)` and is just not refracted. What is the refractive index of the medium?

Explanation

Given that `i=C=45^(@)`
`mu=(1)/(sinc) rArr mu = (1)/(sin 45^(@))`
`mu=(1)/(1//sqrt2)=sqrt2`
`mu=1.414`