Why do the seven colors of sunlight emerge separately after passing through a prism?

Question

Why do the seven colors of sunlight emerge separately after passing through a prism? — Exam MCQ

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D. Different colors travel at different speeds in glass — The correct choice is Different colors travel at different speeds in glass. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.

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A. Colors are absorbed at different rates

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B. Prism shape blocks some colors

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C. All colors move at the same speed in glass

Why do the seven colors of sunlight emerge separately after passing through a prism?

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