Total internal reflection : When the angle of incidence exceeds critical angle, light ray is totally reflected back to the same medium, no refraction of light. This phenomenon is called total internal reflection. The phenomenon occurs if the light angle of incidence is greater than a certain limit angle, called critical angle.
In general, total internal reflection takes place at the boundary between two transparenal media, when a ray of light in a medium of higher index of refraction approches the other medium at angle of incidence greater than the critical angle. For a water-air surface the critical angle is 48.5°.
According to given question incident angle 47°, which is less than critical angle of water to air. in this case total internal reflection will not occur.
