AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Answer: B — Dispersion, internal reflection and refraction
A rainbow is formed when water droplets refract and disperse sunlight, reflect it internally, and refract it again as light exits, separating colours (VIBGYOR) in the direction opposite to the Sun.
Source: Chapter 10, Section 10.4
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The textbook explicitly states: "The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, and finally refract it again." This makes Option B the only correct combination. Scattering and diffraction are not involved in rainbow formation — don't confuse rainbow with sky colour (scattering) or shadow phenomena (diffraction).