Answer:
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.
Explanation:
The movement of the algorithmic waves of the ocean in the world wide brain
B is the answer to number 1
Explanation:
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