Ans is (3) greater than
Angle of incidence must be greater than critical angle
The critical angle is the smallest angle of incidence that yields total reflection.
If angle is equal or less then critical angle it will bend along or inside the surface respectively
Optical fiber works on the principle of Total internal reflection
Total internal reflection is a phenomenon which occurs when a propagating wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.