JEE Main Online Paper (Held On 26-May-2012)
A) no light
B) green and blue colours
C) red and green colours
D) Red colour only
Correct Answer: D
Solution :
For light to come out through face 'AC', total internal reflection must not take place. i.e.,\[\theta <c\Rightarrow \sin \theta <\sin c\]\[\Rightarrow \]\[\sin \theta <\frac{1}{\mu }\] or\[\mu <\frac{1}{\sin \mu }\Rightarrow \mu <\frac{1}{\sin {{45}^{o}}}\] \[\Rightarrow \mu <\sqrt{2}\Rightarrow \mu <1.414\]
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