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light  Noun something that makes vision possible
reflection  Noun a. the return of light or sound waves from a surface

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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