Question

what is the reason of dispersion?​

Answer 1

Answer:

Dispersion occurs due to the different degrees of refraction experienced by different colours of light. Light of different colours may travel with the same speed in a vacuum, but they travel at different speeds in some refracting medium.

Explanation:

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Answer 2

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All colours of light travel at the same speed in a vacuum. When these enter a transparent substance like prism, all slow down by different amounts depending on their wavelength. As these slow down by different amounts, different colours are refracted through different angles.

This phenomenon is known as Dispersion.