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A pinhole camera consists of a closed box with a tiny hole in one side. Light enters the camera through the hole, and an inverted image of the outside world is projected onto a flat or curved surface inside.
If you let the light from an object go through a small hole in a card then on the other side, you can see a real image on a screen. In this demonstration, we make the simple pinhole camera and see which objects can be imaged and which cannot.
The camera we make is a PVC pipe of a few cm length. At one end we fix a paper with a small hole of about one mm of diameter and at the other end we fix a slightly oily butter paper.
An image is formed when at any point on the screen, you get light from a definite point of the object. In a lens, refraction ensures that. In pinhole camera,the small size of the hole ensures that. The image is faint as only a small pencil of light from a given point of object reaches the screen.
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