How does a theater projector that is only a few inches wide, create a perfectly clear picture hundreds of times it original size?

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How does a theater projector that is only a few inches wide, create a perfectly clear picture hundreds of times it original size?

In: Technology

Basically you use a super powerful. lamp, shine it through a lens, through the film, and onto a sheet with a really high albedo, and the rest is on the film strips.

Getting it all in focus is the hard bit.