1. The problem statement, all variables and given/known data. On the course, I was asked a question: What is less absorbing electromagnetic wave: metal or glass? Explain why. 3. The attempt at a solution Now, i'm not sure if i did it correctly. I answered that glass is less absorbing electromagnetic wave due to it's structure and that metal is a good conductor, so it will absorb the wave and transform it into the heat. But still i'm not certain about my answer, because it is also said that electromagnetic wave hardly penteratres material. I'll be very grateful for every answer.