This educator's guide from discusses optics, light, color and their uses. Activities include: (1) "Reflection of Light with a Plane (Flat) Mirror--Trace a Star"; (2) "Reflection of Light with Two Plane Mirrors--Double Mirrors Placed at a 90-Degree Angle"; (3) "Reflection of Light with Two Plane Mirrors--Double Mirrors Placed at a Number of Angles"; (4) "Making a Kaleidoscope--Construction of a Large Kaleidoscope Using PVC Pipe"; (5) "Making a Periscope"; (6) "Constructing a Spectroscope"; (7) "Exploring Diffraction with a Spectroscope--The Electromagnetic Spectrum"; (8) "Diffraction of Light by Very Small Apertures"; (9) "Discovering Color with a Prism--Fabrication of a Prism from Acrylic Plastic"; (10) "Light and Color--Color Spinners"; (11) "Light and Color--Filters"; (12)"Light and Color--Hidden Messages"; (13) "Simple Magnifiers"; (14) "Focusing Light with a Lens"; (15) "Building a Telescope--Diagrams of Reflector and Refractor Telescopes"; (16) "Building a Microscope--Construction of a Microscope--A File Folder Microscope"; (17) "Interference Fringes"; and (18) "Polarization of Light. (MVL)