Question

How many images are formed for a point object kept between the two plane mirrors M₁ and M₂ at the right angles to each other? Show them by drawing a ray diagram.

Answer 1

Step 1: Given data

The angle between the mirrors is $\theta ={90}^o$

Step 2: Formula used

Number of images formed is $n=\frac{{360}^o}{\theta }-1$

Step 3: Calculation of number of images

Number of images formed would be

$$\begin{gathered} n=\frac{{360}^o}{\theta }-1 \\ =\frac{{360}^o}{{90}^o}-1 \\ =4-1 \\ =3 \\ n=3 \end{gathered}$$

Thus, the number of images formed is $n=3$

Step 4: Ray diagram of the image formed

The diagram for the above would be:

Hence, we observe the image formed when the object is placed between two mirrors that are at right angles is $n=3$.