Why objects appear smaller as the distance increases?

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In summary, whether an object is visible or detectable from a distance depends on the definition of "visible" and the conditions of the universe. If "visible" means visible to the human eye, then at a certain distance, there will be too few photons to form an image. However, if by "visible" we mean detectable, then theoretically, an object will always be detectable as long as there is no obstruction or interference between it and the observer. This is assuming the experiment is conducted in a non-expanding universe and enough time is given for a photon to reach the observer.
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Meruem
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Since objects look smaller and smaller as we go far from it, is it possible at some point the object won't be visible,even if there is nothing between two objects ?
 
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Depends somewhat on what you mean by "visible". If you mean "visible to the human eye" then definitely because at some point the incidence of photons hitting the eye will be so few that no image will be formed.

If you mean "detectable" then theoretically, no, if you really could separate them with nothing at all in between, and if you were willing to wait long enough for a photon to arrive, AND if you were conducting the experiment in a universe that was not expanding (as our is).
 
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1. Why do objects appear smaller as the distance increases?

Objects appear smaller as the distance increases because of a phenomenon known as perspective. This means that the further away an object is, the smaller it appears to our eyes. This is due to the way light travels and is interpreted by our brains.

2. How does perspective affect the size of objects?

Perspective affects the size of objects by making them appear smaller as the distance between the object and the observer increases. This is because the light rays from the object are spread out over a larger area, making the object appear smaller to our eyes.

3. Is the size of an object actually changing as the distance increases?

No, the size of an object does not physically change as the distance increases. It is simply an optical illusion caused by perspective. The object remains the same size, but our perception of it changes.

4. How does the size of an object affect its appearance in photographs?

The size of an object can greatly affect its appearance in photographs. This is because the camera captures the object from a fixed distance, and objects that are further away will appear smaller in the photo. This is why photographers often use techniques like zooming or changing their distance to capture objects in a certain perspective.

5. Can we use math to calculate the change in size of an object as the distance increases?

Yes, we can use mathematical equations to calculate the change in size of an object as the distance increases. This is known as the "inverse square law" and it states that the perceived size of an object decreases in proportion to the square of the distance from the observer. This law is commonly used in fields such as astronomy and photography to accurately capture and measure objects at varying distances.

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