Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good workbook to understand geometric optics

Easy to understand and lots of sample problems to follow along as you try to understand equations. At the end of the chapters, there are 20-30 problems with answers. Unfortunately, the questions at the end of the chapters do not have an explanation of how they came up with the answer, but it's not hard to figure out. This book is great aid for first year optometry students.