A) \[45{}^\circ \] with x-direction
B) \[135{}^\circ \] with x-direction
C) \[60{}^\circ \] with x-direction
D) No sufficient data
Correct Answer: A
Solution :
The propagation of ray takes place in perpendicular direction of wavefront. Here, \[{{m}_{1}}{{m}_{2}}=-1\] \[{{m}_{1}}=\]slope of wave front\[=-1\] \[{{m}_{2}}=\]slope of ray \[(-1){{m}_{2}}=-1\Rightarrow {{m}_{2}}=1\] \[\tan \theta =1\Rightarrow \theta ={{45}^{o}}\]
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