A lens forms an upright and diminished image of an object when the object is placed at the focal point of the given lens.
Draw a ray diagram to show the image formation.

Explanation

To solve the problem of drawing a ray diagram for a concave lens that forms an upright and diminished image when the object is placed at the focal point, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Lens Type**:
- We are dealing with a concave lens. Concave lenses are thinner at the center and thicker at the edges.

2. **Draw the Principal Axis**:
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