Sorry bro, this video is too lengthy. I wasted my 10 minutes. Suggestion - please don't include other shits in your answer. Rather just get to the point instead of revolving around the same word. Like wtf torque comes and go in the reflection and refraction. Man you still need something more in this field. Just go through the video yourself and compare your words with the stuff you have on pdf. Thenafter compare the same with the resources. Thenafter you might get why your audience aren't able to understand your video.