Image is inverted when I look into a projector lens -- Why?

  • Context: Undergrad 
  • Thread starter Thread starter guyburns
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SUMMARY

The discussion centers on the optical behavior of a film projector, specifically the Pathescope GEM 9.5mm, when viewing images through its lens. Users observe that while the film is loaded upside down, the projected image appears right-side up on a screen due to the dual inversion caused by the lens and the film's orientation. The eye's lens also contributes to this inversion, resulting in different perceptions when looking directly through the projector lens versus viewing the projected image on a surface. Key insights include the role of the eye's lens in image perception and the mechanics of virtual versus real images in projection systems.

PREREQUISITES
  • Understanding of basic optics, specifically convex lenses.
  • Familiarity with film projection systems, particularly the Pathescope GEM 9.5mm projector.
  • Knowledge of image inversion principles in optics.
  • Basic understanding of human vision and how the eye processes images.
NEXT STEPS
  • Research the principles of convex lens optics and ray diagrams.
  • Explore the mechanics of film projection systems and their configurations.
  • Study the human visual system, focusing on how the brain interprets inverted images.
  • Investigate the differences between virtual and real images in optical systems.
USEFUL FOR

Filmmakers, optical engineers, educators in physics, and anyone interested in the mechanics of image projection and human vision.

  • #31
Thanks for all the additional responses. I've got a lot of thinking, and a few more experiments to do.
 

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