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refracted ray lies right along boundary between mediums. Angle of refraction = 90 degrees
a pattern which results from the interference of two or more waves traveling the same medium. always characterized by an alternating pattern of nodes and antinodes
positions along the medium where there are points of maximum amplitude due to a crest meeting a crest or a trough meeting a trough
mathematical equation which relates the indices of refraction and angles for a light ray traveling from one medium to another
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