How is it that a camera is able to focus on a set distance, yet blurring things both closer and farther? Whats the difference between a near small image and a far large image?
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The rays of light emanating from an object need to be narrowed down to a single point for them to be picked up by the human eye or a camera sensor as a clear picture. That’s what the lens in your eye/in your camera is for. Without that, the image would be entirely blurry
Light from objects at different distances comes at different angles, which require lenses of different focal length. The focal length is simply a measure of how strongly the light we receive is converged. Thankfully, the human eye’s lens can contract and dilate to change the focal length, and cameras have small motors that shift the position of the lens to focus as well.
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