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125 mW green laser. Anyone have any advice on safety issues? I assume as long as you are pointing at a matt surface (wall) the reflection is disperse enough not be harmful. Wear sunglasses? Buy the special protective eyewear? Thanks.

I am teaching physics next year. I am interrested in getting a green laser pointer to do some tricks, but really, I haven't gotten a chance to look into it too much. Popping balloons, using mirrors to reflect. I need a couple things, if anyone would be sooo kind to help me with this :) 1- What...