entrance pupil

noun

, Optics.

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

Example Sentences

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg