Find the position of the object of height 5 cm in front of a concave lens of focal length 20 cm to get the image at a distance of 15 cm from the lens. Also find the height and nature of image formed.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Identify the given values
- Focal length of the concave lens (f) = -20 cm (negative because it's a concave lens)
- Image distance (v) = -15 cm (negative because the image is virtual and on the same side as the object)
- Height of the object (h_o) = 5 cm

### Step 2: Use the lens formula to find the object distance (u)
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