Rayf ShiellRayf Shiell passionately balances 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 range of couses and delights in uncovering the often surprising connections between them. His love of good pedagogy has permeated not only this present text, from which he has taught for many years, but all his work as a mentor and instructor, extending also 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, which features in each chapter of this text. For this work he was a co-recipient of Trent University's 2021 Award for Educational Leadership and Innovation. Read More Read Less