In an optical system (generally a lens), the entrance pupil is the optical image of the physical aperture, as 'seen' through the optical elements in front of the stop. The corresponding image of the aperture stop as seen through the optical elements behind it is called the exit pupil.
In an optical system (generally a lens), the entrance pupil is the optical image of the physical aperture, as 'seen' through the optical elements in front of the stop. The corresponding image of the aperture stop as seen through the optical elements behind it is called the exit pupil.
Source: Wikipedia "Entrance pupil" · CC BY-SA 4.0
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