As a result there is no critical angle (total reflection) for the interface from air to water.

Why not use a laser and total internal reflection to measure the surface?

Light may be confined in the middle layer by total internal reflection.

The total reflection observed is determined by the interference of all these reflections.

If the angle of incidence is further increased, the total reflection persists.

Light is kept in the core by total internal reflection.

Another common example of total internal reflection is a critically cut diamond.

This phenomenon, called total internal reflection, is used in fiber optics.

They are not a total reflection of how a school is providing education for pupils.

Hence, the reflections occur through total internal reflection so very little light is lost.