AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The splitting of white light into its component colours (VIBGYOR) when it passes through a glass prism is called dispersion.
Source: Chapter 10, Section 10.4 – Dispersion of White Light by a Glass Prism
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The examiner expects the single key term dispersion. You may add that the resulting band of colours is called a spectrum for completeness, but the direct answer to "what is the name given to…" is dispersion. Remember VIBGYOR as the order of colours produced.