Can I calculate the size of a real object by just looking at the picture taken by a Camera? (I think people do that) i dont understand how? (from physics point of view)
Answer
If you know the specifics of the camera (lens system, aperture settings, etc.), then you can make a direct relationship between the size of the image and the angular size.
But without a distance measurement (something the camera does not do), you can't turn that into an absolute size.
If there is other information in the photograph that gives the distance, then the size can be calculated.
If all you have is the image (and not the information about the specifics of the camera), then even the angular size cannot be calculated.
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