Total internal reflection occurs when

Q.

For total internal reflection to occur, incidence angle must be greater than the critical angle.

Q. In total internal reflection, the angle of incidence is ___ the critical angle.

Q. For a wave to undergo total internal reflection ( critical angle and i incident angle)

Q. A ray of light enters a glass optical fibre (refractive index 1.45) surrounded by air. Calculate the angle of incidence greater than which causes total internal reflection.

If the angle of incidence is greater than the critical angle then it leads to Total internal reflection of light.
Critical angle $\left({\theta }_c\right)={\sin }^{-1}\left(\frac{1}{\mu }\right)$
$={\sin }^{-1}\left(\frac{1}{1.45}\right)={43.6}^{\circ }$

Q. Which of the following are the essential conditions for Total Internal Reflection to take place?
A. Ray of light should travel from rarer medium to denser medium.
B. Ray of light should travel from denser medium to rarer medium.
C. Angle of incidence should be greater than the critical angle.
D. Critical angle must be greater than the angle of incidence.