An object is placed at a distance of 30 cm from a concave lens of focal length 30 cm.
(i) Use lens formula to determine the distance of the image from the lens.
(ii) List four characteristics of the image (nature position, size, erect/inverted) in this case.
(iii) Draw a labelled diagram to justify your answer of part (ii).

Explanation

To solve the problem step by step, we will follow the lens formula and analyze the characteristics of the image formed by the concave lens.

### Step 1: Identify the given values
- Object distance (u) = -30 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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