A) \[{{90}^{o}}\]
B) \[{{270}^{o}}\]
C) \[{{0}^{o}}\]
D) \[{{180}^{o}}\]
Correct Answer: D
Solution :
Impact parameter\[b\propto \cot \frac{\theta }{2}\]. Here\[b=0\], hence,\[\theta ={{180}^{o}}\]
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