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Chromatic image through a double circle aperture

  1. Apr 22, 2013 #1
    Hi,

    I am conducting an experiment and i am displaying diffraction images of light through 2 pinholes on a DSLR camera. I get a good image with lasers but when I capture images of chromatic light i only get the top half (semi circle) image. can someone explain to me why this occurs? I think its something to do with the camera sensor and pixel ratio but i am not sure.

    Thanks.
     
  2. jcsd
  3. Apr 22, 2013 #2

    Danger

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    I have absolutely no knowledge of this subject, but do (vaguely) know something that might have bearing upon it. When looking up why cats have slit pupils in their eyes, I discovered that it's because circular ones distort colour perception according to what angle the light approaches from. Slits eliminate that.
    It's probably irrelevant to you, but I figured that I should mention it.
     
  4. Apr 22, 2013 #3
    Ah ok thanks very much for your reply, it might be to do with the angle but i think it is something depending on the pixel resolution n sensor.
     
  5. Apr 22, 2013 #4

    Danger

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    You're probably right. I did just realized that I didn't express that explanation quite properly. It's not the incident angle of the light into the pupil that matters; it's the distance from the centre, which affects the angle at which the lens deflects it. Having thought that through, I realize that it wouldn't apply to a camera.
     
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