An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Identify the given values
- Object distance (u) = -15 cm (negative because the object is on the same side as the incoming light)
- Focal length (f) = -30 cm (negative for a concave lens)

### Step 2: Use the lens formula
The lens formula is given by:
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