Question

wht is total internal reflection..???​

Answer 1

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Answer:

Total internal reflection or TIR is the reflection of light back into the medium in which it was traveling.

It occurs when the ray travels from denser to rarer medium .

The angle of incidence should be greater than the critical angle (ic) while travelling .

Example → Sparkling of diamond , mirage in desert

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Answer 2

Total internal reflection (TIR) is the phenomenon that makes the water-to-air surface in a fish-tank look like a perfectly silvered mirror when viewed from below the water level. If the internal and external media are isotropic with refractive indices n1 and n2 respectively, the critical angle is given by {\displaystyle \theta _{{\text{c}}\!}=\arcsin(n_{2}/n_{1})} {\displaystyle \theta _{{\text{c}}\!}=\arcsin(n_{2}/n_{1})}, and is defined if n2 ≤ n1.  For example, for visible light, the critical angle is about 49° for incidence from water to air, and about 42° for incidence from common glass to air.