Hello everyone. I have a question about waves and how they interact in certain settings. 1.) What happens when two EM waves (of different frequencies and amplitudes) arrive at the same space at the same time, and are traveling 45 degrees to one another? Do their trajectories, amplitudes, and frequencies change at all? I've heard of cancelling, but I thought this cancelling wasn't really cancelling at all. 2.) Is there any scenario in which an EM wave traveling through air, goes into a medium and then comes out of the medium with different characteristics other than velocity and direction? (wavelength, frequency) Thank you for taking the time to read this. I have to come up with a senior project this summer. I will have access to a 3D printer which can print materials with certain properties which can effect an EM wave. (permittivity, permeability, reflectivity). I will first model the concept in Comsol, then have the concept printed and tested. I'm actually a Physics major but was assigned to work in the EE department for this project. I'm trying to come up with ideas for what I can do for this project.