<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> 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 point source only the umbra is cast . </P>

What are umbra and penumbra region of a shadow