Hi, today a question crossed my mind. I was thinking about mirrors and colors, why they exist and how does light interact with them. And I always heard that white is the mix of all colors, and that white reflects all the colors. It makes sense because one points a red light to a white wall, the wall becomes red as it would with any other color. The rainbow effect also confirms this. But if white reflects all the colors, then why is not a perfectly smooth white surface a mirror? What is the difference between a mirror and a smooth white color? Another question is, if light are photons with mass, then if one points a very powerful light source at a mirror, by Newton's second law, the mirror is being pushed away from the light. Right? I am an engineering student and sometimes things like this cross my mind... Can you recommend a book that answers this kind of questions? I have never studied the light or optics so I am a begginer in the subject but with good math skills. I tend to be theoretical. Thank You.