Rainbow- how many colors does it have?

Everyone saw a rainbow, but maybe not everyone knows how many colors it actually has? We can distinguish several basic colors, which transition from one to another in this beautiful phenomenon, namely red, yellow, green, blue, and violet. Isaac Newton was the first to describe this multicolored arc, who believed that the rainbow consists of 7 colors, adding orange and indigo to the 5 basic colors. Although he counted six colors, he believed that the mystical number 7 fits better with the rainbow and added indigo. A rainbow is an optical illusion resulting from the dispersion of visible light into colors from which it is composed. A beam of white light refracts and reflects inside water droplets, painting a colorful arc in the sky, always red at the top and violet at the bottom. In order for a rainbow to form, light and water droplets are needed, so it appears during rain when the sun comes out. The sun must be below 42 degrees above the horizon and its rays must fall on raindrops. Each color corresponds to a different wavelength. In fact, the rainbow is a circle with an angular width of 42 degrees, and its center is called the antisolar point, which is exactly opposite the Sun. Standing on Earth with the Sun behind us, the antisolar point will be below the horizon. That's why we can't see the entire rainbow in the form of a circle, but only its arc. The full rainbow can be seen from an airplane flying above the clouds. Why are there sometimes two rainbows or more? The occasionally appearing second rainbow above the first one is the result of a double reflection of light inside water droplets. The intensity of colors in the secondary arc is always weaker because some of the light has already been scattered. Under favorable conditions, we can see not only two but even more arcs next to each other. In the summer of 2011, Michael Theusner was the first to capture a quadruple rainbow near the city of Bromerhaven in Germany, and a few years later, American photographer John Entwistle saw and photographed five colorful arcs next to each other in New Jersey. According to scientists, supernumerary rainbows only form when falling raindrops are almost the same size, less than 1 mm in diameter. Fun fact: in Poland, there is a village named Tęcza in the Świętokrzyskie Voivodeship, Opatów County, Iwaniska municipality.