This mirror can form a diminished virtual image

Explanation

To solve the question about which mirror can form a diminished virtual image, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Image Formation**:
- A diminished image is one that appears smaller than the object. A virtual image is one that cannot be projected on a screen because the light rays do not actually converge at the image location.

2. **Identifying the Type of Mirror**:
...