A) \[{{60}^{o}}\]
B) \[{{90}^{o}}\]
C) \[{{120}^{o}}\]
D) \[{{30}^{o}}\]
Correct Answer: B
Solution :
| [b] The number of images is given by |
| \[n=\frac{{{360}^{o}}}{\theta }-1\] |
| \[3=\frac{{{360}^{o}}}{\theta }-1\], \[\theta ={{90}^{o}}\] |
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