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Unit C: Light and Optical Illusions 1 2 3 4 5 7 8 6 9 10 11 12 13 14 17 18 19 15 16 20 21 22 23 25 26 28 24 27 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Across Down 5. Process in which a substance emits light after it has absorbed ultraviolet light 11. A diagram that traces the path that light takes in order for a person to view a point on the image of an object 13. Describes objects that produce light 1. The part that changes the size of a camera's aperture 2. Describes materials that allow some light to pass through 3. Form of artificial light; uses ultraviolet light waves to make coating inside an opaque tube glow white 17. An optical instrument with a lens for each eye, used for viewing distant objects 19. The number of pixels per unit are in a digital image 20. System that detects reflected microwaves 21. Process of creating an mage using a computer 22. Angle between the reflected ray and the normal 23. Opening in the eye that lets in light 25. A telescope that uses a converging lens to collect light 27. Reflection that happens when parallel rays hit a rough surface 28. Eyes that are made up of many smaller units 30. Colours of visible light 32. All forms of radiant energy 39. Describes objects that do not produce light but may reflect it 40. Flat mirror 41. Angle between the incident ray and the normal 45. Curved piece of glass or other transparent material that refracts light in a predictable way. 46. Material that is sensitive to light 48. The measurable amount of a property, 50. Yellow, cyan, and magenta: colours made adding any two primary colours of light 51. An optical instrument designed to make distant objects appear nearer 53. Special lining on the back of the eye 54. The ability of certain organisms to produce light by a chemical reaction. 55. Hole or opening in a camera that lets in light 56. Reflecting surface that bulges out like the back of a spoon 4. Theory that explains what happens when coloured lights are mixed together. 6. Device that converts light into electrical energy 7. Nerve that leads from the retina to the brain 8. Describes animals that are active at night 9. Decribes materials that do not allow light to pass through. 10. Short for picture element 12. Model used to explain the characteristics and behavior of light energy 14. Unit of a compound eye 15. Reflection that happens when parallel ray hits a smooth surface 16. Image formed when rays meet at a point 18. Piece of transparent material that is thinner in the middle than at the edges 24. Band of muscle around in the eye that controls the size of the pupil and the amount of light entering the eye. 26. refers to the whole range of wavelengths of visible and invisible electromagnetic radiation 29. An optical instrument used to view tiny objects 31. A telescope in which a mirror is used to collect and focus light 33. Any technology that uses light 34. Eyes that are round and have a cornea, a lens and a retina 35. Reflecting surface that is curved inward like the middle inside of a bowl or spoon. 36. Line perpendicular to a surface (that is, forms 90 degree angle with the surface 37. Red, green, and blue light: adding these three olours of light produces white light. 38. Light-produced organ found in bioluminescence organisms 42. Part that acts like a door to control the amount of light entering a camera 58. Piece of transparent material that is thicker in the middle than at the edges 59. Bending of light as it travels from one material to another material 43. Form of artificial light; uses electrical energy to heat a thin wire thread that glows white hot 44. Specialized cells in the retina that detect colour 47. Describes materials that allow light to pass through with little or no reflection 49. Light-sensitive cells found in the retina of the eye 52. Ray of light that arrives at a mirror or other substance 57. Specialized cells in the retina that are sensitive to low levels of light