entrance pupil

noun

, Optics.

the image of the aperture viewed from the objective of an optical system limiting the rays that enter the system.

The field of view 2w retains its importance 427 if the entrance pupil is increased.

The axis of such a cone, which connects the object point with the centre of the entrance pupil, is called the principal ray.

The centre of the projection or the perspective centre is the middle point of the entrance pupil C.

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