umbraˈʌm brə
umbra (n)
- plural
- umbras
English Definitions:
umbra (noun)
a region of complete shadow resulting from total obstruction of light
umbra (Noun)
A shadow.
umbra (Noun)
The central region of a sunspot.
Umbra
The umbra, penumbra and antumbra are the names given to three distinct parts of a shadow, created by any light source after impinging on an opaque object. For a point source only the umbra is cast. These names are most often used to refer to the shadows cast by celestial bodies, though they are sometimes used to describe levels of darkness, such as in sunspots.
umbra
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast. These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.
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"umbra." Kamus.net. STANDS4 LLC, 2024. Web. 7 May 2024. <https://www.kamus.net/english/umbra>.
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