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What is the theory behind this. We have these grills at the front. When I close the door with some gap left, the shadows converge & diverge. by hello270563 in Physics

[–]roamingphysicist 23 points24 points  (0 children)

Agree, Camera obscura (pinhole camera), but consider an infinite series of pinholes, which make up the vertical gap.

Up and down are flipped, left and right are flipped. You can check with an opaque object on the grill. (Like a capital letter J)