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How do you explain this? (Optics)

  1. Jun 13, 2015 #1
    Hi. As you can see in the video attached, the image of the street is projected on the ceiling! Only a window glass and a simple curtain is involved. How does this happen? And how can I optimize (the window angle curtain etc) to get the most clear picture?

  2. jcsd
  3. Jun 13, 2015 #2


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    2017 Award

    Your curtains are probably acting as a pinhole camera. The linked article provides the formula for the selection of pinhole size.
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