Indeed, if the divine source of this light is infinite—Ein Sof—according to Alter Rebbe’s principle that light is just as the luminary, and thus light must be infinite as well. [7] ...

The graph above tells us that this light will refract to a 40-degree angle in the water. If you point to where you see the bird through Snell's window, you'll actually be pointing at empty sky.

Mini planetary parade to light up skies tomorrow - everything you need to know A mini planetary parade will see Jupiter, Mercury, Uranus, Mars, Neptune and Saturn align above the horizon Comments ...