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Question

A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45$$^{\circ}$$. The ray undergoes total internal reflection. The possible value of refractive index of the medium with respect to air is


A
1.245
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B
1.324
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C
1.414
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D
1.524
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Solution

The correct option is C 1.414
$$\mu_{medium} \times \sin 45^{\circ} =\mu_{air}$$

$$\dfrac{\mu_{medium}}{\mu_{air}}=\dfrac{1}{\sin 45^{\circ}}
=\sqrt{2}
=1.414$$

Physics

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