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Video by username planters, here and on PL
So basically what he's doing is using prisms to combine (not to scale, color difference greatly exaggerated):
Of course, the difference in angle of refraction is so low that you need a lot of distance for these beams to converge. So NO, you cannot put this in a pointer. I think he could do away with one prism though:
So basically what he's doing is using prisms to combine (not to scale, color difference greatly exaggerated):
Of course, the difference in angle of refraction is so low that you need a lot of distance for these beams to converge. So NO, you cannot put this in a pointer. I think he could do away with one prism though: