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, given the diameter of the moon and its distance from the Earth, we can follow these steps:

### Step 1: Understand the given data
- Focal length of the concave mirror, \( f = -8 \) m (negative because it is a concave mirror).
- Diameter of the moon, \( D_{moon} = 3450 \) km = \( 3.45 \times 10^6 \) m.
- Distance from the Earth to the moon, \( u = -4 \times 10^5 \) km = \( -4 \times 10^8 \) m.

### Step 2: Use the mirror formula
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