What is pinhole camera ? Why do we get an inverted image instead pinhole camera? What is aperture? What happens when the aperture size is increased? What is solargraphy? L

A pinhole camera, also known as camera obscura (literally, "dark chamber"), is a simple optical imaging device in the shape of a closed box or chamber. In one of its sides is a small hole which, via the rectilinear propagation of light, creates an image of the outside space on the opposite side of the box. A pinhole camera is completely dark on all the other sides of the box including the side where the point is created. This part is usually painted black, but black boxes are also used for this purpose. There is also a thin screen which looks like a projector sheet, and is put in between the dark side adjacent to the pinhole.