Rayf ShiellSince 2004 Rayf has passionately balanced both research and teaching at Trent University, Canada. His primary research is in optics, and ranges from probing matter using high-power laser beams to exploring the optics of the eye. He teaches a wide rane of courses, and delights in uncovering and relaying the often-surprising connections between them. His love of good pedagogy has permeated not only this present text, with which he was very familiar, from many years of teaching, but all his work as a mentor and instructor, even extending to coaching the university rowing team. He is co-developer of the integrated testlet, an assessment tool that employs a scaffolded, answer-until-correct question structure, and which features in each chapter of this text. For his work in this area he was a co-recipient of Trent University's 2021 Award for Educational Leadership and Innovation. Read More Read Less