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 5 years ago 

Nope, no lens! It works like a pinhole camera - https://en.wikipedia.org/wiki/Pinhole_camera

Pinhole camera
A pinhole camera is a simple camera without a lens but with a tiny aperture (the so-called pinhole) – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.