The sun must also not be obscured by mountains or dark clouds. Therefore, sunny, and rainy days are best to see a rainbow. For us to be able to see a rainbow, the angle at which light is refracted is 42 degrees. So, what is a rainbow? The rainbow you see in the sky is formed when sunlight passes through droplets of water, the light is refracted and reflected, thus creating the rainbow colors. In fact, there may be more than one million colors, we simply just cannot see these other colors. This was a simple way to explain colors, however, there are not only seven colors. Since he was a fan of Pythagoras, who considered there to be a connection between music and color, he changed it to seven colors to coincide with the number of musical notes. However, to make it easier to discuss the matter, Newton originally divided the spectrum into five colors. So, why does a rainbow have only seven colors? These colors form a visual spectrum, meaning each color blends into the next so there are no actual distinct colors. When these colors pass through the prism, they will bend or refract at different angles, which is what causes the rainbow of colors visible to the eye. On the other hand, you have red, which has the longest wavelength of 700 nanometers. All colors have wavelengths, which can be measured in nanometers, for example, violet has a short wavelength of 380 nanometers. These colors are visible to the naked eye and are part of what is known as the visible light spectrum. This proved white light is composed of a vast spectrum of colors. When white light moves through a prism, the light refracts and produces various colors. Another famous scientist, Sir Isaac Newton, also contributed to this research with his glass prism experiment, which explained the breakdown of white light. The first person or philosopher to describe light reflections and refraction in the 17th century was René Descartes.
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