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Across 3. Hole in your eye that allows light to pass through 4. Equal amount of each primary light colour produces _______ 6. Part of the shadow in which all light rays from a source are blocked 7. These are used for television signals and cellphones (2 Words) 9. Wavelengths are measured in ________ 12. Photoreceptor cells used to detect colour (2 Words) 17. Materials that transmit light freely 19. Substance that glows after being exposed to energized particles 21. This colour has a wavelength of 600 nm 24. These rays are used to kill cancer cells 25. The point where light rays meet (2 Words) 27. Light emitted by substances when they are exposed to electromagnetic radiation 30. This kind of gas emits colour when electricity runs through it 32. This type of image is formed by rays that do not actually pass through the location of the image 33. Cyan light on a yellow object makes the object appear _______ 35. Light produced from a chemical reaction without a rise in temperature 38. Acronym to remember all colours of the rainbow 39. These types of rays come from the Sun

Down 1. The light you see from an incadescent bulb is the ________ glowing 2. When light rays reflect off a rough or uneven surface it produces _______ reflection 3. Red, blue, and green are all __________ light colours 5. The part of your eye that is coloured 8. Entire range of electromagnetic radiation is called.... (2 Words) 10. These are used in radar guns 11. Light-sensitive layer of your eye 13. Objects that absorb and reflect light only 14. Red, blue and green are all __________ subtractive colours 15. Middle point of a curved mirror 16. The ability of a substance to glow in the dark 18. Where does white light come from? 20. When light reflects off a surface, the angle of incidence is always equal to the angle of reflection (3 Words) 22. One nanometer is equal to one ________ of a meter 23. Ability of a plant or animal to produce light 26. Green light + red light = _________ light 28. Frosted window pane is a good example of a __________ material 29. __________ waves come out of your TV remote control 31. Drawings that show the path that light takes after it leaves its source (2 Words) 34. Image formed by light rays that converge at the location of the image 36. The shorter the wavelength the ________ the frequency 37. Transparent glass or plastic object with flat, polished sides