Question

Total internal reflection is possible when light rays travels

Answer 1

For incident angles greater than total internal reflection will occur. For incident angles equal to refraction will occur at . The light must travel from a medium with a higher refractive index (higher optical density) to a medium with lower refractive index (lower optical density).

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.