A) 30°
B) 45°
C) 60°
D) 0°
Correct Answer: B
Solution :
From figure \[A={{r}_{1}}+c={{r}_{1}}+{{\sin }^{-1}}\left( \frac{1}{\mu } \right)\] \[\Rightarrow {{r}_{1}}=75-{{\sin }^{-1}}\left( \frac{1}{\mu } \right)\] \[\Rightarrow 75-45={{30}^{o}}\] From Snell?s law At B \[\mu =\frac{\sin i}{\sin {{r}_{1}}}\]\[\Rightarrow \sqrt{2}=\frac{\sin i}{\sin {{30}^{o}}}\]\[\Rightarrow i={{45}^{o}}\]You need to login to perform this action.
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