There's a interface between epoxy/plastic and air.hairbair said:
The main difference between Frensel reflection and Total Internal Reflection is the angle at which the light ray hits the boundary between two media. Frensel reflection occurs when the angle of incidence is less than the critical angle, while total internal reflection occurs when the angle of incidence is greater than the critical angle.
Frensel reflection and Total Internal Reflection both involve the reflection of light at a boundary between two media. However, Frensel reflection results in some of the light being transmitted through the boundary while Total Internal Reflection results in all of the light being reflected back into the original medium.
The critical angle is the angle of incidence at which Frensel reflection transitions to Total Internal Reflection. If the angle of incidence is less than the critical angle, Frensel reflection occurs. If the angle of incidence is greater than the critical angle, Total Internal Reflection occurs.
Yes, Frensel reflection and Total Internal Reflection can occur at any boundary between two media as long as the angle of incidence is less than or greater than the critical angle, respectively. This phenomenon is not limited to a specific type of media.
Frensel reflection and Total Internal Reflection have a variety of applications in everyday life. Some examples include: the reflective coating on glasses and camera lenses, the shining of light through fiber optic cables, and the use of Total Internal Reflection in prisms to create rainbows.