A pinhole camera is a simple camera without a lens and with a single small aperture which effectively is a light-proof box with a small hole in one side. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box. The human eye in bright light acts similar to cameras by using small apertures.
Up to a certain point, the smaller the hole then the sharper the image, but this became a dimmer projected image.
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