A ray of laser of a wavelength


A ray of laser of a wavelength $630 \mathrm{~nm}$ is incident at an angle of $30^{\circ}$ at the diamond-air interface. It is going from diamond to air. The refractive index of diamond is $2.42$ and that of air is 1 . Choose the correct option.

  1. angle of refraction is $24.41^{\circ}$

  2. angle of refraction is $30^{\circ}$

  3. refraction is not possible

  4. angle of refraction is $53.4^{\circ}$

Correct Option: , 3


$\sin \theta_{C}=\frac{1}{\mu}=\frac{1}{2 \mu_{2}}<\sin \theta_{C}$

$\sin \theta>\sin \theta_{C}$


Total internal reflection will happen

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