A) light goes from optically rarer medium to optically denser medium
B) light goes from optically denser medium to rarer medium
C) the refractive indices of the two media are close to different
D) the refractive indices of the two media are widely different
Correct Answer: B
Solution :
According to Snell?s Law\[\frac{\sin i}{\sin r}=\frac{{{\mu }_{2}}}{{{\mu }_{1}}}\] where \[r=90{}^\circ \] for particular incidence angle called critical angle. When the incidence angle is equal to or greater then i, then total internal reflection occurs. It take place when ray of light travels from optically denser medium (\[{{\mu }_{1}}\] >\[{{\mu }_{2}}\]) to optically rarer medium.
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