User talk:109.186.128.117

September 2021
Hello, I'm AngryHarpy. I wanted to let you know that I reverted one of your recent contributions—specifically this edit to Transfer-matrix method (optics)—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks.  Angry Harpy   talk 08:07, 3 September 2021 (UTC)