Total internal reflection can take place only if

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Light goes from optically denser medium to rarer medium

Light goes from optically rarer medium (smaller refractive index) to optically denser medium

The refractive indices of the two media are close to different

The refractive indices of the two media are widely different

answer is B.

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Detailed Solution

According to Snell’s Law, $\frac{\sin i}{\sin r} = \frac{μ_{2}}{μ_{1}}$

where r = 90º for particular incidence angle called critical angle. When the incidence angle is equal to or greater than i_c , then total internal reflection occurs. It takes place when ray of light travels from optically denser medium $(μ_{1} > μ_{2})$ to optically rarer medium

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