Comments by "Angry Kittens" (@AngryKittens) on "Veritasium"
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@RastaTailSpike, exactly. The pinhole camera effect has pretty much infinite depth of field. It is not a lens. It is not affected at all by how far you are from the wall.
Instead it is affected by how small the hole is. The larger the hole, the blurrier it gets, as you move further away.
The only real problem of the camera obscura effect is exposure. There is a very limited amount of photons entering the hole, so the further you move from the wall, the fainter the image becomes. But again, it will NOT blur. Even if you're in a room the size of the galaxy, you can still project a sharp image on the other side of the room, provided it's dark enough that you can see it.
In fact, the largest single photograph ever created was made by turning an entire aircraft hangar into a camera obscura. Covering it completely and then puncturing the side with a tiny hole.
That said, pinhole cameras do also blur, but paradoxically, it happens when the hole is too small. This is due to diffraction (not diffusion), and results in wave-like patterns on the image.
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Religion is the direct ancestor of science. These stories were our early attempts to understand the natural world. But while the rest of knowledge moves on as new things are discovered, people have a tendency to stick to old knowledge, insisting that these were good enough. These are religions (although this also applies to old scientific beliefs as well).
The reasons for doing so may vary., but it's mostly the natural human psychological aversion to cognitive dissonance. As curious beings, we are driven to attempt to explain why things are the way they are. But at the same time, once we have found a comfortable explanation, we find it difficult to accept new things that contradict said explanation. And even if we do accept, we tend to hold on to parts of the old explanation that have not been debunked.
Especially when the explanation CAN explain MOST things, except for the new discoveries. In such cases, it's easier to discard the new data. The reason why new theories usually take a while before gaining acceptance in the scientific community, is the same reason why religions persist.
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