The color red corresponds to wavelengths of 625 nanometers to 740 nanometers in the electromagnetic spectrum.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html#c1</ref> | The color red corresponds to wavelengths of 625 nanometers to 740 nanometers in the electromagnetic spectrum.<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html#c1</ref> |