Determine the diameter of the image formed by a spherical concave mirror of focal length 8 m. The diameter of the moon is 3450 km and the distance between the earth and the moon is approx `4xx10^(5)` km.

Explanation

To determine the diameter of the image formed by a spherical concave mirror of focal length 8 m, we will use the following steps:

### Step 1: Identify the given values
- Focal length of the concave mirror (f) = -8 m (the negative sign indicates that it is a concave mirror)
- Diameter of the moon (D) = 3450 km = 3.45 × 10^6 m (convert km to m)
- Distance between the Earth and the moon (L) = 4 × 10^5 km = 4 × 10^8 m (convert km to m)

### Step 2: Calculate the angle subtended by the moon at the mirror
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