How do water droplets create a rainbow?

• A. They absorb sunlight
• B. They reflect only certain colors
• C. They separate the colors of sunlight through dispersion
• D. They magnify the light

Answer: (C)

Water droplets create a rainbow by separating the colors of sunlight through a process known as dispersion. When sunlight enters a water droplet, it slows down and bends, or refracts, at different angles depending on its wavelength. This bending of light causes it to spread out into its constituent colors, creating a spectrum.

As light exits the droplet, it undergoes a second refraction, further separating the colors. The result is the wide spectrum of colors we see in a rainbow, typically visible as red, orange, yellow, green, blue, indigo, and violet arranged in a circular arc. This phenomenon is why the dispersion of light through water droplets is essential for the formation of a rainbow—it specifically utilizes the refractive properties of water to display the full range of colors found in visible light.