11498
The Huygens–Fresnel principle is one such model ; it states that each point on a wavefront generates a secondary wavelet , and that the disturbance at any subsequent point can be found by summing the contributions of the individual wavelets at that point .
 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