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whats the difference between a red 5mw laser pointer and a green 5mw laser pointer?
can you see the beam with the green one?
The basic difference is in the colour! Seriously though, it's just a matter of which part of the spectrum the laser is using - the human eye sees colours in the range of about 400nm (the violet end) to 700nm (the read end). Green is about in the middle, around 560nm so it's usually easier to see, particularly if the red is close to the limit of detection, i.e., before going into the infrared region above 700nm.
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