Answer:
If \[\theta \] is a submultiple of\[\text{18}0{}^\circ \], then the number of images formed is \[n=\frac{360}{\theta }-1\] If \[\theta \] is not a submultiple of\[\text{18}0{}^\circ \], then the number of images formed is the integer next higher than\[\left( \frac{360}{\theta }-1 \right)\] .
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