The correct answer is C. Prisms.
A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the Sun shines onto droplets of moisture in the Earth’s atmosphere. Rainbows can be full circles. However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centered on a line from the Sun to the observer’s eye.
The rainbow is caused by the refraction, reflection, and dispersion of light in water droplets suspended in the atmosphere. Sunlight enters a water droplet and is refracted (bent) as it enters the droplet. The light is then reflected off the back of the droplet and refracted again as it exits the droplet. The angle of refraction depends on the wavelength of the light, so the different colors of light are refracted at slightly different angles. This causes the light to separate into a spectrum of colors.
The water droplets in a rainbow are acting as prisms. A prism is a transparent object that separates white light into its component colors. The colors of the rainbow are arranged in order of their wavelength, with red being the longest wavelength and violet being the shortest wavelength.
The rainbow is a beautiful and awe-inspiring phenomenon that has been observed and described by humans for centuries. It is a reminder of the power of nature and the beauty of the world around us.