The Crisis of Prism Derivative

Lately,  I'm having a crisis that I called a "Prism Derivative Crisis". Which is about the derivative of the prism. It's stressful and challenging. Yes, and it's an assignment under the Vibrations, Waves & Optics (VWO) course. More specifically, Optics. I can think that this is just an introduction. I'm sure I will be facing the worst(i mean hard) questions that can probably be asked. For Year 2, there is a course just for Optics. I'm not saying that this subject is not interesting and really difficult. If another student is able to do it, then I actually can too. It just consists of hardworking, struggle, and understanding.