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  1. N

    I have tried the water with milk

    I can see the beam, but in water, the beam is only about 10cm. Maybe I need a stronger laser. Is 100mW strong enough? The beam has to be shown at least 70cm long.
  2. N

    What kind of laser should I use?

    Our club is preparing for my school festival, and we are planning to make a parabola. The matter is, we are going to use laser to show people that if the light go into the parabola, it goes through the focus of the parabola. SO, the laser beam should be seen, but we bought a laser that is not...


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