A ray of light moving along the unit vector (`-i-2j`)undergoes refraction at an interface two media
Channel: Doubtnut
Date: 23/08/2020

A ray of light moving along the unit vector (`-i-2j`)undergoes refraction at an interface two media,which is the x-zplane. The   refracive index for `ygt0`,it is`sqrt(5)//2`.the unit vector along which the refracted ray moves is: