When white light is incident on a prism, which one of the resulting color components will have the lowest index of refraction? A. Green B. Yellow C. Orange D. Blue

The correct answer is C. Refractive index is dependent on the wavelength this is seen in the Cauchy equation. The refractive index decreases with increasing wavelength and since orange has the highest wavelength among the choices given thus it will have the least refractive index.