Why is white light dispersed by a prism?

Question

Why is white light dispersed by a prism? — Exam MCQ

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B. Its colours travel through the glass at different speeds — The refractive index and speed in glass depend on wavelength, so different colours refract by different amounts.

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A. It emits seven colours throughout the prism

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C. The colours are reflected by the prism

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D. All colours are refracted at the same speed

Why is white light dispersed by a prism?

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