Question
How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?
$a. 120^\circ $
$b. 45^\circ $
$c. 180^\circ $
$d. 60^\circ $
$e. 90^\circ $

Answer

The formula to calculate the no. of images of an object placed between $2$ plane mirrors $\Big(\frac{360}{\theta}\Big)-1$ where theta is the angle of inclination.$2\Big(\frac{360}{120}\Big)-1=3-1=2$
$7\Big(\frac{360}{45}\Big)-1=8-1=7$
$1\Big(\frac{360}{180}\Big)-1=2-1=1$
$5\Big(\frac{360}{60}\Big)-1=6-1=5$
$3\Big(\frac{360}{90}\Big)-1=4-1=3$

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