Question

total internal reflection is possible when light travels from

Answer 1

Total internal Reflection is possible only when light travels from denser medium to rarer medium. As light rays travel from denser to rarer medium the refracted light rays bends away from normal and beyond a particular angle the refracted rays moves in a same medium.

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.