By far the best proof is experience.  

Sir Francis Bacon (1561 - 1626)

Depth of field

Depth of field refers to the in-focus region of an imaging system. When using a lens, especially in close proximity, objects at and near a certain distance will be in focus whereas other objects in the field of view that are closer or farther away will appear fuzzy, or out of focus. The depth of the region that appears in focus is called the depth of field. Generally speaking, the depth of field will be large if the lens aperture is small (large fnumber), and the depth of field will be small with a wide aperture (small f-number). 

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