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@@ -40,6 +40,11 @@ Equal sided prism with blue and red light being dispersed.
 
 Grin material with coordinate system tilted against global coordinate system.
 
+![Rainbow Droplet](https://user-images.githubusercontent.com/12564815/28295078-7fcfed9c-6b5e-11e7-8710-13fce405dfe0.png)
+
+Water droplet which bends the light of different wavelengths differently in order to create a rainbow.
+The material data was obtained from https://refractiveindex.info by Mikhail N. Polyanskiy.
+
 ## Formulas
 
 If you want to use formulas in issues or wikis, then the following example would be useful: