How do you read the Brewster angle formula / equation?

ddedeasx
Homework Statement:
I have a presentation tomorrow, in which I have to explain the formula used in the Brewster angle, so I have to say what each symbol there means (the n1, n2, tan ...)
Relevant Equations:
tan(0B) = n2 /n1
So far all I know is that n1 and n2 represent the refractive indices of the two media, and so is theta (I think). Please help

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