Calculate NDVI from Sentinel 2A in ArcGIS

How to Calculate NDVI from Sentinel 2A in ArcGIS
The NDVI ratio can be determined from the contribution of visible wavelength and near-infra-red wavelengths. Strong and well-nourished vegetation will absorb most of the visible wavelengths that it receives and will reflect back a large proportion of the near-infra-red light, whereas poor condition vegetation or thin areas, will reflect more visible wavelength light and less near-infra-red light.
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