A) \[1.7\]
B) \[1.4\]
C) \[1.2\]
D) \[2.7\]
Correct Answer: B
Solution :
The ray diagram is as follows \[\angle A=\angle C={{45}^{\circ }}\] \[\therefore \] \[i={{45}^{\circ }}\] At both the faces \[AB\] and\[BC\]. For total internal reflections at faces, we have \[\sin \,\,i>\frac{1}{n}\] Or \[n>\frac{1}{\sin \,\,i}>\frac{1}{\sin \,\,{{45}^{\circ }}}>\sqrt{2}\] The minimum value of \[n\] should be \[\sqrt{2}\left( =1.414 \right).\]You need to login to perform this action.
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