entrance pupil
Americannoun
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The iris in the eye dilates and constricts, acting as an entrance pupil.
From Textbooks ● Aug. 12, 2015
This distance replaces the angle u in the preceding considerations; and the aperture, i.e. the radius of the entrance pupil, is its maximum value.
From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg
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