Assertion (A): The splitting up of white light into seven colours on passing through a transparent medium like a triangular glass prism is called dispersion of light. Reason (R): The rainbow is an arch of seven colours visible in the sky which is produced by the dispersion of sun’s light by the tiny raindrops in the atmosphere.

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KollegeApply · Accepted Answer

Both A and R are true but R is not the correct explanation of the assertion. Explanation: The assertion is true because the breakdown of white light into its seven component colours when passing through a triangular prism accurately defines the phenomenon of dispersionTgQPHd|||[]. The reason is also true because a rainbow is a natural manifestation of dispersion caused by atmospheric raindrops acting like tiny prisms. However, the reason is not the correct explanation for the assertion because it merely provides a real-world exampleTgQPHd|||[] of dispersion (the rainbow) rather than explaining the underlying physical causeTgQPHd|||[] of why light splits inside a prism (which is due to different colours of light travelling at different speeds in a medium).TgQPHd|||[]

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