I am working on a research project for school, and i have an image being projected at a 270 degree angle on to a piece of glass that is angled at about a 30 degree angle itself. I need to find the angle of refraction as the projection enters the glass and then exits. Picture of Problem: Also is there a special type of glass i should buy for the project so that there is no reflections from around the room and to make sure i get the best quality image. Also i am afraid that if i get 99% transmissive glass that the projection will go right through and not refract through the glass. Any help would be greatly appreciated. Thank you.