Question

Describe total internal reflection of light what is the essential condition for its occurrence

Answer 1

We can now define the total internal reflection as the phenomenon of reflection of light into a denser medium when the angle of incidence of a light traveling in a denser medium is greater than the critical angle of the medium. There are two conditions which are essential for total internal reflection.

Answer 2

$\underline \bold{Total\:Internal\: Reflection}$

When the light ray refracts from denser to rare medium, and for a certain angle of incident then the ray travels along the interface of two media by making the angle of reflection equal to right angle.

The angle of incidence for which the reflected ray Travels along the interface of to media is called as Critical Angle.

The phenomena of 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.