Why is a green laser beam visible while a red or blue beam is not?

Why is a green laser beam visible while a red or blue beam is not?
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answer:See this site for a graph of the visibility spectrum. Here is an excerpt: “The actual visibility of the ray will vary depending on the color, power, moisture and dust content in the air.. Range can be miles depending on the absorption of the medium. Note that the brighter the ray, the less power at the impact point. This is why on a foggy night the ray can be strikingly visible but the impact point will be of limited range.”
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