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@@ -55,6 +55,12 @@ pyrateoptics.draw(s)
 # This function can get a list of raypath argument to draw rays.
 ```
 
+![grin_1](https://user-images.githubusercontent.com/12564815/40586439-3adda2f0-61c2-11e8-89b7-ee88b96ff7d4.png)
+![grin_2](https://user-images.githubusercontent.com/12564815/40586440-3b027a80-61c2-11e8-89b3-01572ace57e3.png)
+![grin_spot](https://user-images.githubusercontent.com/12564815/40586441-3b23f1d8-61c2-11e8-87e6-e17fec4490fb.png)
+
+An optimized plano-plano GRIN lens with 1.6 micron RMS centroid spot radius.
+
 ![Achromat](https://cloud.githubusercontent.com/assets/12564815/24765016/89a5d27c-1af6-11e7-9eb7-92d9687486c0.png)
 
 An achromat.