1. For two plane mirrors inclined at an angle $\theta$, the number of images $n$ formed is given by:

when $\frac{360^\circ}{\theta}$ is an integer.

2. Here, the angle between the mirrors is:

So,

Since this is an integer, we use:

3. Therefore, the number of images formed is:

4. Checking options:

• A: $5$ ✅
• B: $6$ ❌
• C: $7$ ❌
• D: $8$ ❌

Hence, the correct option is A.