A) 1.7
B) 1.4
C) 1.2
D) 2.7
Correct Answer: A
Solution :
The ray diagram is as follow \[\angle A=\angle C={{45}^{o}}\] \[i={{45}^{o}}\] At both the faces AB and BC. For total internal reflection at three faces. \[\sin \,i>\frac{1}{n}\] \[n>\frac{l}{\sin \,i}\Rightarrow \frac{l}{\sin {{45}^{o}}}>\sqrt{2}\] \[n=1.1717\]You need to login to perform this action.
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