Refraction

What Is refraction?

Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another. Refractive index (n) of a medium such as air or water tells us how fast light travels in that medium. It is the ratio of the speed of light in a vacuum (c) to the speed of light in this medium (v): n = c / v. The bending of a light as it crosses the boundary into a different medium is determined by its refractive index, or how much the light is slowed down in the new medium.

Newton and the color spectrum: dispersive refraction

Isaac Newton established that refraction causes white light to separate into its constituent wavelengths. While he was not the first to demonstrate that a prism produces a spectrum of colored light from incident white light, he showed that a second prism could recombine the colors to create white light again. He also demonstrated that the individual colors remained constant when shone through a prism again. This was in stark contrast to the consensus that the prism itself produced colors. Newton’s contribution created a new understanding that white light is a mixture of colored light, and that each color is refracted to a different extent. The different colors correspond to light with different wavelengths, and are refracted to differing degrees. This separation of colors is known as dispersion.

Once the colors in sunlight are separated by refraction, we are able to distinguish them in the splendor that is a rainbow.

Real Life Application Of Refraction

When the Sun shines from behind, and there are rain clouds ahead, you can sometimes see a rainbow. This is caused by white light being refracted by the raindrops, but this time being reflected back to the eye as well. The colours of the rainbow are red, orange, yellow, green, blue, indigo and violet. These colours can be remembered by the first letters of a sentence like: Read over your good book in vain. There are other sentences too, and you might know different ways of remembering the sequence.