A) \[\frac{2}{\sqrt{3}}\]
B) \[\frac{\sqrt{3}}{2}\]
C) \[\sqrt{2}\]
D) \[\frac{1}{\sqrt{2}}\]
Correct Answer: C
Solution :
The critical angle (C) is that angle of incidence for which the angle of refraction becomes \[{{90}^{o}}.\]It is given by, \[\sin C=\frac{1}{\mu }\] or \[\mu =\frac{1}{\sin C}\] or \[\mu =\frac{1}{\sin {{45}^{o}}}\] \[(\because \,C={{45}^{o}})\] or \[\mu =\frac{1}{1/\sqrt{2}}=\sqrt{2}\] Note: Critical angle increases with increase in temperature of medium.
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