270440
The expanded laser beam illumination in the N-slit interferometer can also take the shape , via the introduction of a convex lens prior to the prismatic expander , of a beam extremely elongated in the propagation plane and extremely thin in the orthogonal plane .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None