Reflected light beams from a point source located where the rim touches the positive $x$-axis
More from Chalkdust
Issue 13
Sus Mafia strategies, LMS president Ulrike Tillmann, and Bae's theorem ❤️ all feature in our spring 2021 edition. Plus all your favourite puzzles & columns.
Cryptic crossnumber (including hints)
Looking for a challenge? Try our cryptic crossnumber—with hints and tips so anyone can have a go!
Creating hot ice
We created hot ice from scratch, a solution that remains liquid even below its freezing point!
Chalkdust Issue 05 coming 7 March
Free launch party, 7.15pm. Come along! Free copies of Chalkdust, free pizza, and buy your own Chalkdust T-shirt.
Curiouser and curiouser!
Some surprising mathematical facts
Find your perfect partner
Find your perfect partner with this wonderful tree diagram!