Angular Resolution & The Angular Limit of Light Propagation. Credited to Curious Life channel: https://www.youtube.com/channel/UCzVscxrvOR1lVNiXF-2zSzw
The visual spectrum of light operates within the range of about 400 to 700 nanometers. Therefore, light cannot propagate at an angle that is too small to accommodate the size of the wavelengths of light. This angular limit of light propagation is approximately the same as the angular limit of our eyesight, i.e. an angle of 0.02 of a degree.
This is why at 6 feet in elevation, we will NEVER be able to see further than approximately 3 miles of a flat surface, the angle at that distance becomes too small to allow for a clear path for light.
This is also why you cannot see things clearly at sharp angles (TVs, paintings, etc.) and guitar strings cannot resonate if they are too close to the neck.
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