Reading Metrics
Grade Level
Upper Grades (UG 9-12)
Book Level
7.3
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
5653
Points per Word
0.000177
Page Count
64
Points per Page
0.015625
Series
Eyewitness Science
Description
This book is a guide to the origins, principles, and historical study of light.