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Across 6. not allowing any light to pass through 7. the light that is cast back from a reflecting surface 9. the angle between the normal and the reflected rays 10. the casting back of light from a surface 12. the emission of light resulting from chemical action and not involving heat 14. representation of the path of light by using a straight line with an arrow 16. The two laws that state the the angle of reflection is equal to the angle of incidence and the incident ray, the normal and reflected rays are always in the same plane. 17. a non-human-mande source of light, such as the sun 20. the process in which high energy, invisible ultraviolet light is absorbed by the particles of an object 22. the persistent emission of light following exposure to and removal of a source of radiation 24. the likeness of an object 26. the angle between the normal and the refracted rays 28. the transfer of radiant energy; such as light 29. energy transferred or emitted as waves or rays in all directions 30. the emission of visible light by a hot object 31. allowing some light to pass through.

Down 1. a mirror having a flat surface 2. giving off its own light 3. a substance that does not give off its own light 4. a human made source of light 5. a flat or level surface 8. the angle between the incident ray and the normal 11. the light that strikes a reflecting or refracting material 13. a reference line drawn perpendicular to a reflecting surface at the point where an incident ray strikes the surface 15. an object that can be heated to such a high temperature that it emits visible light 18. the emission of light produced by chemical reactions inside the bodies of living creatures 19. the bending of light when it travels from one material to another 21. allowing light to pass through 23. a single line or narrow beam of light that originates from a light source and that may bounce off a surface that it strikes 25. to send out energy in the form of waves or rays 27. the form of energy we can see