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

Explanation

To solve the problem, we need to analyze the situation involving a concave lens and an object placed in front of it. Here’s a step-by-step solution:

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

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