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Opics: making lantern's

  1. Apr 19, 2008 #1
    I am really stuck on what to do.

    "The completed lantern needs to produce a tightly focussed spot of light on a stage, it is positioned 12m horizontally away from it and 5m above it. It also has to fit a box that is 30cm long"

    Parts avaliable:
    light bulbs
    light bulb holders
    convex lenses - focal lengths of 2cm, 10cm and 50cm.
    concave mirrors - focal lengths of 5cm, 20cm

    could anyone help me with what i have to do to create the lantern.
  2. jcsd
  3. Apr 21, 2008 #2
    This would make an excellent Gaussian Beam Optics question using the ABCD law.
    How well do you know your matrix techniques for ray propagation?
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