If a person’s mind wanders during the reading of the Megilah, it is questionable if he is yotzei. The Poskim say that if the person could answer “what was read just now?” or, alternatively, if he would notice an obvious error in the reading, there is enough concentration there so that he is yotzei. It is recommended to keep one’s finger on the place when following the k’ri’ah.
Shabbos Bulletin Parshas Vayikra (Parshas Zachor) & Purim 5779
About the Author: Lev Seltzer
Lev Seltzer has been a member of Beis Tefillah from just a short time after its founding. He currently manages the BTYA.org website, and can be found every morning in the BTYA "Vasikin Room" where he is the gabbai of the minyon.