I would like to join points (s) and (t) via arc. Could u help me to implement it?! I've tried it by such way \draw (s) arc (t); It is wrong! To say simply I need the correct arc without spreading over ...
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 ...