1. glass
2. burn
3. scanner
4. periscope
5. optical illusion
6. distortion
7. telescope
8. aberration
9. optician
10. microscope
11. crown glass
12. flint glass
13. reflecting telescope
14. spectroscope
15. sight
16. ametropia
17. collimator
18. densitometer
19. optical crown
20. prism
21. stereoscope
22. viewer
23. perspective
24. opacity
25. binoculars
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26. diffraction grating
27. motion
28. planetarium
29. spherical aberration
30. viewfinder
31. apparent motion
32. apparent movement
33. binocular
34. biprism
35. finder
36. grating
37. laser
38. lens system
39. movement
40. naked
41. opaqueness
42. optical aberration
43. optical flint
44. optical prism
45. parallax
46. polarimeter
47. prism spectroscope
48. pseudopsia
49. pyroscope
50. reflector
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51. refracting telescope
52. sextant
53. view finder
54. epidiascope
55. objective
56. camera
57. crown lens
58. chromatic aberration
59. coma
60. pleochroism
61. asthenopia
62. canal
63. coelostat
64. diffuser
65. diffusor
66. disk
67. enlarger
68. erecting prism
69. eriometer
70. eyeglasses
71. field glasses
72. glasses
73. jeweler's glass
74. kaleidoscope
75. kerr cell
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76. micropsia
77. nicol prism
78. opera glasses
79. optical maser
80. polariscope
81. rochon prism
82. specs
83. spectacles
84. stauroscope
85. trick
86. virtual image
87. wollaston prism
88. condenser
89. focus
90. telephoto lens
91. wide-angle lens
92. zoom lens
93. fisheye lens
94. power
95. closeup lens
96. episcope
97. portrait lens
98. resolve
99. transparency
100. xanthopsia
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