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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.
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The Column of Trajan combines the glory of battle with details of soldierly life to support the Roman sense of military and cultural superiority over its enemies.
Located in the Trajan's Forum in Rome Italy, this monument honors the victory of the Roman army of Emperor Trajan in the Dracian Wars. The column represents the many battles between Dacians and the Roman Empire.
This impressive monument also served as a propaganda tool in that it served the Roman Empire to show the power of the Roman army in different campaigns and its dominion over the Dacians.
