Bo - Slapping Pharaoh in the Face

In this shiur, delivered in Mevaseret, Rav Burg explains why only after Makkas Choshech did Pharaoh and Moshe become angry with one another. What was the value in Moshe Rabbeinu slapping Pharaoh in the face? The ten Makkos are meant to rectify the ten dimensions of the soul. In this shiur each Makkah is explored so as to understand why everything changed after Choshech.