How do we see things that don't create photons?

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In summary, objects can be seen by reflecting or scattering light, they do not necessarily need to emit light themselves. The color we see is determined by the type of photons the object reflects or absorbs.
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linux kid
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How do we see things? I know we see things when photons are created by the object or other photons. But how do we see things that don't create photons?

For example: if you look at a red piece of paper in a room that is lit with a regular lightbult. The paper does not create photons so what's happening?
 
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The paper reflects the light from the bulb.
 
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Objects don't need to emit light to be visible, they only need to reflect or scatter light coming from somewhere else.

Claude.
 
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linux kid said:
For example: if you look at a red piece of paper in a room that is lit with a regular lightbult. The paper does not create photons so what's happening?
Why the piece of paper appears red is because it is reflecting the "red photons" more than it reflects other photons (which it ends up absorbing). So, it's mostly the red photons that make it to your eyes.
 

1. How can we see objects that don't emit light?

While most objects that we see emit or reflect visible light, there are other ways in which we can sense objects. One way is through thermal radiation, which is the infrared light given off by objects with heat. Another way is through reflected sound waves, which is how bats and dolphins use echolocation to "see" their surroundings.

2. Can we see objects in complete darkness?

Yes, we can see objects in complete darkness with the help of technology. Infrared cameras, night vision goggles, and thermal imaging devices can detect and convert the invisible infrared light emitted by objects into visible images. Some animals, such as cats and owls, also have superior night vision capabilities that allow them to see in low light conditions.

3. How do we see objects that are transparent?

Transparent objects, such as glass or water, allow light to pass through them without being absorbed or reflected. We are able to see these objects because the light that passes through them is bent or refracted, making the object visible. This is why objects appear distorted when viewed through a glass of water, for example.

4. How do we see objects that are too far away for visible light to reach us?

We are able to see objects that are too far away for visible light to reach us through the use of telescopes. Telescopes collect and magnify light from these distant objects, allowing us to see them. In addition, scientists also use other forms of electromagnetic radiation, such as radio waves and X-rays, to "see" objects in the far reaches of the universe.

5. How do we see objects at the atomic or subatomic level?

At the atomic or subatomic level, traditional forms of light are not sufficient for us to see objects. Instead, scientists use specialized tools such as electron microscopes, which use beams of electrons instead of light, to create images of these tiny objects. This allows us to see the intricate details of atoms and molecules that are otherwise invisible to the naked eye.

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