© All rights reserved by André Kuipers
From my friend, Phil Plait's, Bad Astronomy blog:
A light bending exercise... in space!
He does a nice job explaining the optics. This is a water blob floating in the zero-g environment of the International Space Station. But to spice things up, the blob was injected with air.
I'll pose a few more challenging questions for my physics-ly brawny readers.
1. Is a spherical water blob a converging or diverging lens?
2. Is an air bubble immersed in water a converging or diverging lens?
3. Ray diagrams?
4. Characterize both images: real or virtual?
But don't forget to take a moment to appreciate the grooviness!