JEE MAIN - Physics (2021 - 25th July Morning Shift - No. 9)
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.
angle of refraction is 24.41$$^\circ$$
angle of refraction is 30$$^\circ$$
refraction is not possible
angle of refraction is 53.4$$^\circ$$
Explanation
$$\sin {\theta _C} = {1 \over \mu } = {1 \over {2{\mu _2}}} < \sin {\theta _C}$$
sin$$\theta$$ > sin$$\theta$$C
$$\theta$$ > $$\theta$$C
Total internal reflection will happen.
sin$$\theta$$ > sin$$\theta$$C
$$\theta$$ > $$\theta$$C
Total internal reflection will happen.
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