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The quantum approach has some striking similarities to the Huygens-Fresnel principle ; in that principle the light becomes a series of individually distributed light sources across the slit which is similar to the limited number of paths ( or wave functions ) available for the photons to travel through the slit .
 person: Huygens-Fresnel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Huygens-Fresnel