Why total internal reflection takes place?

Answer 1

It happens when light travels through a material that has a greater "optical density" (refraction index, really) than a bordering material, and when it touches the surface at an angle that is sufficiently flat.

Answer 2

Total internal reflection occurs when a light hits its medium at an angle wider than a certain critical angle, depending upon what's normal to that medium. If the refractive index and the incident angle on the other side are measured lower or greater, respectively, the light is totally reflected.

Answer 3

When light ray has to traverse from a denser medium to the rarer medium and the angle of incidence is more than the critical angle then all the rays would be reflected back into the denser medium itself. Hence total internal reflection

Answer 4

TIR happens when the angle at which light or sound waves hits an object is larger than a particular critical angle with respect to the surface.

Hope I helped :)

Answer 5

1) The light ray must be travelling from denser to rarer medium.

2) The angle of incidence in the denser medium must be greater than the critical angle.

Answer 6

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