entrance pupil
noun
The aperture through which light enters an optical system; the image of the aperture stop as viewed from the front; specifically the image of pupil of the eye as seen from outside the eye; the pupil itself.
- The entrance pupil determines the cone of light entering an optical system..
Origin
Late 19th century.
- sexual pervert
- sexual-political
- sexual politician
- sexual politics
- sexual psychopath
- sexual psychopathy
- sexual relations
- sexual repression
- sexual reproduction
- sexual revolution
- sexual selection
- sexual system
- sexuate
- sexuated
- sexupara
- sexupare
- sexuparous
- sex urge
- sexvir
- sexvirate
- sex work
- sex worker
- sexy
- Seychelles
- Seychellois