Find the critical angle of a plate of glass with n=1.6
It is 2.15 degrees!
Batman said! It must be true! He is Batman after all.
not this time
Tyler, one of our six ZOoF readers, wrote: "I had run out of time for the bonus ( I had a minute left) so I drew a quick Batman in hopes he would give me some points."
Thanks Tyler, that made me chuckle!