Question

Why is the image formed by a pinhole camera upside down?

Answer 1

Because light travels through air in a nearly perfectly straight line: The light travels from the top of the tree, straight through the pinhole, and straight to the BOTTOM of the image. ... Thus theimage is inverted. Left and right are reversed for the same reason.

Answer 2

Light travels through air in straight line. Usually, light comes from a source like sun, torch or something and passes through the pinhole results flipped image as it gets flipped as it enter the hole and hits the sensor. So it’s not possible to get the image upright, unless you manage to fit a lens in to help it, flip over again and again, resulting inverted image. So we see the image formed by a pinhole camera upside down.