Pin hole camera
By 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.
- Put up two LEDs, one blue and one red, side by side. Connect them to adapters and lit them.
- Face your camera towards the LEDs, the hole towards the LEDs. Can you see the image?
- Check, which of the image is on left and which is on the right. Is it in the same order as the actual LEDs or it gets reversed in order?
- Check if you can see the details of an LED in the image, its round body and so on.
- Increase the distance of the camera from the LEDs. What happens to the image?
- Face the camera towards other objects like a photo on your mobile screen. Are you able to see the image?
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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