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The moon is 3.5 × 106 m in diameter and 3.8× 108 m from the earth's...

The moon is 3.5 × 106 m in diameter and 3.8× 108 m from the earth's surface.
The 1.9-m-focal-length concave mirror of a telescope focuses an image of the moon onto a detector.

What is the diameter of the moon's image?

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