A ray of light moving along the vector (`-i-2j`)undergoes refraction at an interface two media,which is the x-zplane. The refracive index for `ygt0` is `2` and below it is`sqrt(5)//2`.the unit vector along which the refracted ray moves is:
A. `(-3hat(i)-5hat(j))/(sqrt(34))`
B. `(-4hat(i)-3hat(j))/(5)`
C. `(-3hat(i)-4hat(j))/(5)`
D. `(3hat(i)+5hat(j))/(sqrt(34))`
