Question

To get 9 multiple images of an object, the angle between two plane mirrors should be:

• A. 60${}^0$
• B. 36${}^0$
• C. 50${}^0$
• D. 90${}^0$

Answer 1

The correct option is B 36${}^0$

$n=9$. Let the angle between two mirrors be $\theta$.

So, $9=\frac{{360}^0}{\theta }-1$

or, $10\theta ={360}^0$

or, $\theta ={36}^0$