A convcave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object from the lens ? Draw the ray diagram.

Explanation

To solve the problem of finding the object distance from a concave lens given its focal length and the image distance, we can use the lens formula. Let's go through the solution step by step.

### Step-by-Step Solution:

1. **Identify the given values**:
- Focal length of the concave lens (f) = -15 cm (negative because it is a concave lens)
- Image distance (v) = -10 cm (negative because the image is formed on the same side as the object)

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