(a) A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from the pole. What is the size of the image? (b) If the object begins to move with speed `V_(0)` , what will be the speed of its image?

Explanation

To solve the given problem step by step, we will break it down into two parts as per the question.

### Part (a): Finding the Size of the Image

1. **Understanding the Mirror Formula**:
The mirror formula for a concave mirror is given by:
\[
\frac{1}{v} + \frac{1}{u} = \frac{1}{f}
...