A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that the end closer to the pole is 20 cm away from it. Find the length of the image.

Explanation

To solve the problem step by step, we will follow these instructions:

### Step 1: Understand the Setup
We have a concave mirror with a focal length (f) of 10 cm. The rod of length 10 cm is placed such that one end (P) is 20 cm away from the mirror's pole (P). The other end (Q) of the rod will be 10 cm further away from P, making it 30 cm from the pole.

**Hint:** Visualize the setup by drawing a diagram of the concave mirror, the focal point, and the rod.

### Step 2: Identify the Object Positions
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