Correct Answer:
A. Water droplets
A rainbow is a beautiful meteorological phenomenon caused by the interaction of sunlight with atmospheric water droplets, involving the processes of reflection, refraction, and dispersion of light.
- The correct option is Water droplets. Rainbows are formed when sunlight passes through tiny water droplets suspended in the atmosphere. These droplets act as miniature prisms, refracting (bending) the light, reflecting it internally, and then refracting it again, separating the white sunlight into its constituent colors.
- Distractors: "Glass" can refract light, but it does not naturally form atmospheric rainbows. "Mirror" reflects light but does not disperse it into a spectrum to create a rainbow. "Crystals" can refract and disperse light, but they are not the medium responsible for natural atmospheric rainbows.