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    Science experiment

    Hello, Now, I have decided to create an experiment based on laser beams, and how they react, so this is the question... "Can you change the speed of light?" I know that the speed of light can be changed depending on the medium its passing through, however can anybody explain this video to me...
  2. T

    How to focus a laser?

    Hello everyone, I'm starting a science project and the problem is how would a laser beam react to different surfaces such as aluminium sheets or plastic bags. I have 200mw 532nm green laser and I've read somewhere that I need to focus and compress the beam to get to burn things and make a big...


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