Why are slides put in the projector upside down?
It’s based on the way the light is transmitted through the lenses. I’ll try to explain it simply:
The bulb of course sits behind the slide…it of course is bigger than the slide itself so light goes through the apparatus like this: O ! >< i
(The "O" is the bulb, the "!" is the slide, the "><" is the light being transmitted within the projector and the "i" is the reversed image.)
So, the image is actually flipped within the projector. Since the bulb is actually larger than the slide, it can't be done any other way in a typical slide projector.
Metallica – Dirty Window | with lyrics
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