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What is Nasal width/length ratio is: and explain in detail?
Nasal index is the ratio of nasal width to nasal height multiplied by 100. 
The nose has been classified into three major groups based on the nasal parameters:

Leptorrhine or fine nose (nasal index of 69.9 or less)
Mesorrhine or medium (nasal index of 70.0 – 84.9)
Platyrrhine or broad nose (nasal index of 85.0 or more)