Which color has less refractive index?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Red light has the lowest refractive index among visible colors in any given material. This is because refractive index varies with wavelength (a phenomenon called dispersion). The relationship is:
- Red (longer wavelength, ~700 nm): Lowest refractive index
- Orange, Yellow, Green: Intermediate values
- Blue, Violet (shorter wavelength, ~400 nm): Highest refractive index
This dispersion is why prisms separate white light into a rainbow—each color bends by a different amount.
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