Question

Two parallel plane mirrors placed facing each other forms $\infty$ images of an object. Does this hold good, if they are placed at an angle $\theta \ne 0$?

• A. Yes
• B. No
• C. Only if angle is of the form $\theta =\pi /n,n=1,2,\mathrm{3....}$
• D. Only if angle is of the form $\theta \ne \pi /n,n=1,2,\mathrm{3....}$

Answer 1

The correct option is B No

Number of images formed are $n=\left(2\pi /\theta \right)-1\text{where}\theta \text{is in radians}$.Hence option B is correct.