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We were discussing in an https://www.physicsforums.com/showthread.php?t=284322" that pinholes work like lenses, in that they form inverted real images. The other day, a friend told me, that pinholes even do bend the light rays like a lens do. I can - as being nearsighted - actually use a pinhole in a cardboard paper instead of my glasses, and then I really get a sharp image of the things I look at through the pinhole! How do you explain this?
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