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|light||Noun||something that makes vision possible|
|reflection||Noun||a. the return of light or sound waves from a
b. the production of an image by or as if by a mirror
|refraction||Noun||Change light's direction by making it pass into another transparent material of different density, like glass or water.|
|periscope||Noun||a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view|
|mirror||Noun||a reflecting surface that forms an image of an object|
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