{arc} is about arc drawing in {tikz} or other graphic environments, including {pstricks}

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How to Intersect an arc with a line without calculating the angle

I'd like to draw an optics-related figure, for which I need to draw several beams with varying opening angles, which will need to be labeled. What I've come up at the moment (boiled down to a minimal ...
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How to place a node in the middle of an arc?

I think it is a simple question, but I didn't find the answer yet. The code I'm using is the following: \draw[->](1,0) arc(0:-30:1) node[midway]{$30$}; But in this way the node is placed at the ...
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3answers
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How to get correct arrow orientation on TikZ arc?

I'm trying to fix the following TikZ figure, where the circle device in the middle should be embraced by two bended arrows pointing counter-clockwise. I have drawn these arrows with an arc path, ...