Assume that distance between the Earth and the Moon is `4 xx 10^(8)m`. Concave mirror of focal length 10 m is used to make the image of the Moon whose diameter is approximately 3,500 km. Calculate the diameter of image of the Moon.

Explanation

To find the diameter of the image of the Moon formed by a concave mirror, we can follow these steps:

### Step 1: Identify the given values
- Distance between Earth and Moon (object distance, \( u \)): \( 4 \times 10^8 \) m
- Focal length of the concave mirror (\( f \)): \( -10 \) m (negative because it is a concave mirror)
- Diameter of the Moon (object height, \( h_1 \)): \( 3500 \) km = \( 3.5 \times 10^6 \) m

### Step 2: Convert the object distance to a negative value
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