^Small angle deviation

^Small angle deviation

δ = A (μ – 1)

δ depends on i, A, μprism, μmedium,

The cause of dispersion is that the speeds of different colours of light in a transparent medium are different.

Also as μv > μr thus δv > δr   i.e. the angles of deviation for different colours are different. It is maximum for violet & is minimum for red colour.

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