What is camera obscura? How and When it happens?
In: Technology
Basically a enclosed box with a tiny hole, light travels through the hole and the world outside projected on the wall parallel to the hole. It was used to make painting back in the day.
Imagine you have a large TV screen facing a wall 2m away. The light from the TV is hitting the wall, but you can see a picture on the wall. It’s just all fuzzy. This is because the light from the TV shines out in all directions. The top of the wall is getting hit by light from the whole TV.
Now suppose you put some kind of screen up in the middle, 1m from each side. You poke a tiny hole in the centre, which lets a little light through. Now, the top of the wall can see through the hole to the bottom of the TV. Similarly, the bottom of the wall can see the top of the TV. This means light from the TV shines through the pinhole onto the wall, and projects an image of the TV which is upsidedown and back to front. The smaller the pinhole, the dimmer the image is because less light can get through. But *also* the sharper the image is, because the light is more directional.
This is how a camera obscura works. But instead of a TV, it can just be the outside world. If you put a film inside, you have a pinhole camera that you can take pictures with.
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