Norwich bitterly protested the penalty decision, which came following a corner and was not given initially by referee Mike Jones until he consulted with Richard West on the far side.
Wenger, though, felt justice had been served.
He said: "Honestly, I have not seen it but people have told me it was a penalty. Television confirmed the penalty.
"Maybe it was not a corner, but they tell me as well it was not a free-kick (for Norwich's goal)."