Plastic Banknotes and lasers

Canadian bank notes are made of plastic. They have transparent sections, and the one shaped like a maple leaf is very special. It has a diffraction grating in it that projects an image of the denomination. Watch the video then try it yourself! Visit my blog here: http://stevemould.com Follow me on twitter here: http://twitter.com/moulds Buy nerdy maths things here: http://mathsgear.co.uk