A light ray enters through a right angled prism at point P with the angle of incidence 30° as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the prism is:
1
\(\frac{\sqrt5}{4}\)
2
\(\frac{\sqrt5}{2}\)
3
\(\frac{\sqrt3}{4}\)
4
\(\frac{\sqrt3}{2}\)