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how to make a home made projector? Answered

by using a  std convex lenses. 


See over on the right under where you appear----------------->

You were 18 on thursday?


This is rarely done just with convex lenses. Websearching "projection lens" will show you a number of diagrams of typical arrangements of lenses for the purpose.

Theoretically, if you aren't too picky about image quality, a gallilean telescope used "backward" ought to come close. But that too has one convex and one concave lens.