The youngest non-readers and the newly literate are given an elementary and accurate description in words and pictures of light rays, how they travel in straight lines and how they can reflect or ""bounce off"" objects. Considering the title and the fact that the mirror is used as a final, re-inforcing example of the action of light rays, it is unfortunate that no description of the very simple parts of the mirror are described. A most satisfactory beginning science book about light but not about mirrors.