How do you explain this? (Optics)

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SUMMARY

The discussion focuses on the phenomenon of an image being projected onto a ceiling through a window and a curtain, likening the setup to a pinhole camera. Participants explain that the curtain acts as a pinhole, allowing light to pass through and project the street image. To optimize clarity, adjustments to the window angle and curtain positioning are recommended. The linked article provides a formula for selecting the appropriate pinhole size for optimal image projection.

PREREQUISITES
  • Understanding of pinhole camera principles
  • Basic knowledge of optics and light behavior
  • Familiarity with image projection techniques
  • Experience with window and curtain positioning for light manipulation
NEXT STEPS
  • Research the formula for pinhole size selection in optics
  • Explore advanced techniques for optimizing image clarity in pinhole cameras
  • Learn about the effects of window angles on light projection
  • Investigate different curtain materials and their impact on image quality
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Optics enthusiasts, photographers experimenting with pinhole techniques, and anyone interested in enhancing image projection using everyday materials.

asmani
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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?
 
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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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