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What is a 'spot' in the context of physics - specifically electronics and photonics?

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According to Wikipedia, it refers to the theoretical idea that there is a 'something' which is an 'absence of an electron'.

Students will not need to know this.

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Oh, now I remember! This is otherwise known as a "hole", which is part of the whole n-p, p-n crap that you don't need to know. – Collin Li♦ Jan 11 at 22:36

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