Answer: Dispersion.
- A Reflection
- B Diffraction
- C Dispersion
- D Interference
Correct answer: C. Dispersion
Explanation: Dispersion is the splitting of white light into its spectrum (VIBGYOR) when it passes through a prism.

Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.
Concept context
Reflection, refraction, lenses, mirrors, total internal reflection.