Verified Solution • 2025–26 Session moderate

QJEEM21Ph9bd9: JEE Main 2021 Physics - Class 11 JEEM21Ph9bd9 Solution: A ray of laser of a wavelength 630 nm is incident at an angle…

A ray of laser of a wavelength 630 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.

Multiple Choice Options

  • A angle of refraction is 24.41 ∘^\circ
  • B angle of refraction is 30 ∘^\circ
  • C refraction is not possible
  • D angle of refraction is 53.4 ∘^\circ

Step-by-Step Verified Solution

\sin {\theta _C} = {1 \over \mu } = {1 \over {2{\mu _2}}} < \sin {\theta _C}

sin θ\theta > sin θ\theta C

θ\theta > θ\theta C

Total internal reflection will happen.

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