The light path for a primary rainbow within a raindrop includes one internal reflection. The sequence is: refraction (entry) → reflection (internal) → refraction (exit). This single internal reflection, combined with refraction and dispersion, separates the light into its constituent colours, forming the rainbow arc.
How many internal reflections of light take place in the formation of primary rainbow ?
Asked in UPSC CDS 1 2021 · Topic: Optics (Prisms and Dispersion)
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