Question

Total internal reflection of light is possible when light enters from

Answer 1

Total internal reflection happens whenlight from a denser medium with a higher index of refraction travels to a less dense medium with a lower index of refraction at an angle greater than the critical angle. When this happens,light does not refract, but it reflects back into the medium.
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Answer 2

When the light ray refracts from denser to rare medium, and for a certain angle of incident the ray travel along the interface of two media.

The angle of incidence for which the reflected ray Travels along the interface of to media is called as Critical Angle and the phenomena bouncing back of light ray in the same medium when reflected from denser to rarer medium and falls in the interface that an angle greater to the critical angle for the given pair of media is called as total internal reflection.

The necessary condition of TIR are

• The light must refracts from denser to rare medium.

• The incidence must be above the critical angle for the pair of media.