Shifts in the political spectrum and larger issues of industrial society prompted important changes in government functions through the second half of the 19th century. Mass education headed the list. Building on earlier precedents, most governments in western Europe established universal public schooling in the 1870s and ’80s, requiring attendance at least at the primary levels. Education was seen as essential to provide basic skills such as literacy and numeracy. It also was a vital means of conditioning citizens to loyalty to the national government. All the educational systems vigorously pushed nationalism in their history and literature courses. They tried to standardize language, as against minority dialects and languages (opposing Polish in Germany, for example, or Breton in France).
You did not attach any curve here. But hope this helps you to answer the question:
Visible light is generally found in the band between 400nm and 700nm. The infrared spectrum is made up of wavelengths longer than the visible spectrum and up to a wavelength of about 1mm (so that band is 700nm to 1mm). Wavelengths longer than 1mm are part of the radio wave spectrum.