Quote of the Day
The most important thing in the world today is that England and the United States speak the same language.
— Otto Von Bismarck
We use tiny ball lenses all the time to mate our fibers up to photodetectors (Source). I was impressed when I saw a news article discussing an enormous, water-filled, ball lens being used to concentrate sunlight onto a solar array. Take a look at the Rawlemon Facebook page. I am always impressed with the green energy efforts being made in Germany. Apparently, it even generates power on overcast days.
Figure 1: Enormous Ball Lens Used for Concentrating Sunlight Onto a Solar Panel.
There are some great graphics on this page. Here are examples:
