A) 9
B) 10
C) 11
D) 12
Correct Answer: C
Solution :
Given the number of images = 5 So, we have\[\frac{{{360}^{o}}}{{{\theta }^{o}}}-1=5\] \[\Rightarrow \] \[{{\theta }^{o}}={{60}^{o}}\] when the angle is decreased to \[\theta -{{30}^{o}},\] ie, \[\theta -{{30}^{o}}={{60}^{o}}-{{30}^{o}}={{30}^{o}},\]the number of images become, \[\frac{{{360}^{o}}}{{{30}^{o}}}-1=11\]You need to login to perform this action.
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