Examlex
____ created the first known Western portrait where the sitter looks directly at the viewer.
Iris Diaphragm
A component in optical devices used to control the amount of light that passes through a lens.
Ocular Lens
The lens within the eye that helps to focus light on the retina, allowing for clear vision.
Base
In chemistry, a substance that can accept hydrogen ions (protons) or more generally, donate a pair of valence electrons.
Stage
A distinct phase in a process or a raised platform used for performances or public speaking.
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