AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
When white light enters a prism, different colours (wavelengths) travel at different speeds in glass and hence refract by different amounts. Since red light bends the least and violet bends the most, each colour emerges along a different path, separating white light into its constituent colours (VIBGYOR) — a process called dispersion.
Source: Chapter 10, Section 10.4 – Dispersion of White Light by a Glass Prism
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Examiners look for two key ideas: (1) different colours bend by different amounts on refraction, and (2) this causes them to emerge along different paths. You must name violet (maximum) and red (minimum) deviation explicitly — these two facts together usually carry 1 mark each or split across the two marks. The word "dispersion" is good to include. Avoid lengthy derivations; a tight 2–3 sentence explanation plus the two named colours is sufficient.