Looking at the world through a CD
From sky to earth


All of us have admired the colors of the rainbow after a rain. The same colors are formed on the bottom surface of an optical disk (CD or DVD).

The rainbow
Rainbow colors on a CD surface

What is the common that happens in the sky and on the surface of an optical disk, so the same colors are displayed; In the case of rainbow, light interacts with water droplets and colors are formed. Also, light interacts with the optical disk surface and the same colors are formed. In general, colors is a result of light - matter interaction.
Bazanos Panteleimon, chemist - secondary education teacher