The capacitance value is small - only 0.1uF, so it is not electrolytic, therefore it is not polarised and can be connected either way.
In terms of the bridge rectifier underneath that noise-filtering capacitor, there are usually "squigles" ( ~ ) moulded or printed on two opposite corners to show AC in, and "+" and "-" for DC out. Modern bridge rectifiers of this size almost always have the corner next to the positive pin cut at a diagonal, and/or that pin turned 90 degrees with respect to the other three pins. However, as said, for this capacitor polarity is not relevant ( actually it may even be wired across the AC input ).
In terms of the bridge rectifier underneath that noise-filtering capacitor, there are usually "squigles" ( ~ ) moulded or printed on two opposite corners to show AC in, and "+" and "-" for DC out. Modern bridge rectifiers of this size almost always have the corner next to the positive pin cut at a diagonal, and/or that pin turned 90 degrees with respect to the other three pins. However, as said, for this capacitor polarity is not relevant ( actually it may even be wired across the AC input ).
