• Question: how long to you thing a lasers light go ?

    Asked by datbagofswags to Becki, Rick on 28 Jun 2013.
    • Photo: Rick Smith

      Rick Smith answered on 28 Jun 2013:

      A laser will travel forever unless it interacts with some other object like gas molecules or something. In empty space, with nothing in the way, there isn’t nothing to stop laser light travelling any distance. Real lasers aren’t perfect and this means that all the particles of light in the laser beam are not all travelling in exactly the same direction so the laser beam will become wider and wider as it travels, So you wouldn’t expect to see a small laser spot after travelling a long distance

    • Photo: Rebecca Scott

      Rebecca Scott answered on 28 Jun 2013:

      Yeah as rick says it will just keep going until something gets in the way but it will get less and less focussed.

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