A) \[2\sin A\]
B) \[2\cos A\]
C) \[\frac{1}{2}\cos A\]
D) \[\tan A\]
Correct Answer: B
Solution :
For the given condition above ray diagram will sift. \[\angle MON=90-\overset{\text{ }\!\!{}^\circ\!\!\text{ }}{\mathop{\text{A}}}\,\] So \[\angle r=90-(90-A)\] \[\Rightarrow \]\[\angle r=\overset{{}^\circ }{\mathop{\text{A}}}\,\] By Snell?s law \[\frac{\sin i}{\sin r}=\mu \] \[\frac{\sin (2A)}{\sin (A)}=\mu \] \[\frac{2\sin A\cos A}{\sin A}=\mu \] \[\Rightarrow \] \[\mu =2\cos A\]You need to login to perform this action.
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