Our understanding of the nature of light has gone through many changes over the centuries. Newton originally developed a particle-theory of light, but this theory was ultimately rejected in favor of the wave description covered in this week's class. However, at the turn of the 20th century, an accumulation of evidence led to the development of the photon theory of light by Albert Einstein and Max Planck.

Describe the differences between Newton's theory of light, the wave theory, and the modern photon theory, and the experimental evidence for each. Also, identify a technology that utilizes the wave theory of light, and one that utilizes the photon theory.