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Umbra / Penumbra (Science Dictionary)

Umbra / Penumbra: The umbra, penumbra and antumbra are the names given to three distinct parts of a shadow, created by any light source. The umbra is the area of total darkness in a shadow caused by an eclipse, while the penumbra is a fringe region of partial shadow around an umbra.

_ ស្វែងរកឬបកប្រែពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖
_ខាងក្រោមនេះជាសៀវភៅនិងឯកសារសម្រាប់ការងារនិងរៀនគ្រប់ប្រភេទ៖
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