Question

The number of images formed by two plane mirrors parallel to each other is.

• A. 0
• B. 1
• C. 2
• D. infinite

Answer 1

The correct option is D infinite

When two plane mirrors are kept parallel to each other, an infinite number of images are formed.
We can ascertain this with the formula for multiple reflections. $N=\frac{360}{\theta }-1$
For parallel mirrors, $\theta =0$. Therefore, $N=\left(\frac{360}{0}\right)-1$ which is taken as infinite.