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