A) \[\text{30 }\!\!{}^\circ\!\!\text{ }\]
B) \[45{}^\circ \]
C) \[60{}^\circ \]
D) Zero
Correct Answer: B
Solution :
[b] For retracing its path, light ray should be normally incident on silvered face. |
Applying Snell's law at M, |
[\frac{\sin i}{\sin 30{}^\circ }=\frac{\sqrt{2}}{1}\] |
\[\Rightarrow \sin i=\sqrt{2}\times \frac{1}{2}\] |
\[\sin i=\frac{1}{\sqrt{2}}i.e.i=45{}^\circ \] |
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