Two plane mirrors are placed making an angle `theta^@` in between them. For an object placed in between the mirrors, if angle is gradually increased from `0^@` to `180^@`, how will the number of images change: increase, decrease or remain unchanged?

Explanation

To solve the problem of how the number of images changes when the angle between two plane mirrors is increased from \(0^\circ\) to \(180^\circ\), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
We have two plane mirrors placed at an angle \( \theta \) with respect to each other. An object is placed between these mirrors.

2. **Formula for Number of Images**:
...