A) \[{{30}^{o}}\]
B) \[{{90}^{o}}\]
C) \[{{0}^{o}}\]
D) \[{{45}^{o}}\]
Correct Answer: B
Solution :
[b] Here |
\[{{i}_{1}}=60\] |
\[A=30\] |
\[\delta =30\] |
Since, \[\delta ={{i}_{1}}+{{i}_{2}}-A\] |
\[{{i}_{2}}=0\] |
So from the surface, it will make. |
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