Refraction of Light | Ray box experiment | - YouTube
Physics revision | GCSE and A Level Physics Revision | Cyberphysics, the revision website
Light Box with Optics Kit - Ray Box Optics Set - Science, Ray Optics Demonstration Kit | Science Kit, Light Box with Optics Kit - Ray Box Optics Set - Science, Ray
Sources of Light Rays Types & Meaning | Types of Rays - Video & Lesson Transcript | Study.com