The refractive index of prism material differs from colour to colour and angle of deviation ‘δ’ a light ray undergoing refraction through a prism depends on its refractive index. Thus, angle deviation is different for different colours of light.
Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Session 2024-2025.
Why is the value of angle of deviation for a ray of light undergoing refraction through a glass prism for different colours of light?
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The angle of deviation differs for different colors of light because each color has a unique wavelength, leading to varying refractive indices in the glass prism. Shorter wavelengths, like violet, are refracted more, causing greater deviation, while longer wavelengths, like red, deviate less.
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