Devender

First off, our eyes can only detect a small portion of electromagnetic spectrum known as visible region (400-700 nm in wavelength). Our retina has no sensitivity for radio, x-rays and other radiations outside of visible region. (Source of image: http://www.sun.org/encyclopedia/electromagnetic-spectrum) Color by reflection Color in a substance can be produced from various mechanisms, most common of which is the reflection. An object is red because it absorbs all the color except red which is reflected back and detected by retina in our eyes. Grass is green because it produces a pigment name Chlorophyll (used for photosynthesis). Chlorophyll is a stronger absorbed of red and blue light and reflects green color and hence the color of the grass. Color by scattering But reflection is not the only mechanism by which color is produced like color of sky can be explained by a scattering phenomenon knows as "Rayleigh Scattering". Rayleigh found that scattering power of partic