The exercises and activities on this worksheet are from Topic 9.4 of the IB Physics syllabus. This includes angular separation, radians, small angle approximation, Rayleigh's criterion, optical resolution, resolution of diffraction gratings, and the spreading of laser beams. There an internet activity as well as a short experimental activity. These exercises were designed to accompany the free video lesson available at https://www.youtube.com/watch?v=qisbozqEOPo There are 4 pages of questions a