A beam of white light undergoes dispersion through a triangular glass prism forming a band of seven colours Which of the statements is/are correct?

(a)The red-coloured component has minimum refractive index.

(b)The violet-coloured component deviates the least

(c)All components of white light have same speed in glass.

Correct option is D

Sol: The correct answer is (d) Only (a)

Statement A: "The red-colored component has minimum refractive index."

The refractive index of light depends on its wavelength. Red light has the longest wavelength among the visible spectrum, and therefore it experiences the least refraction (deviation) and has the minimum refractive index in the prism. In a prism, the refractive index decreases as the wavelength increases (i.e., for red light). (Correct)

​Statement B: "The violet-colored component deviates the least."

The violet light, which has the shortest wavelength, deviates the most when passing through the prism. This happens because shorter wavelengths are refracted more due to their higher refractive index in the prism material. So, violet light deviates the most, not the least. (Incorrect)

​Statement C: "All components of white light have the same speed in glass."

Different components (colors) of white light travel at different speeds in glass because their refractive indices are different. Red light, with a lower refractive index, travels faster than violet light, which has a higher refractive index. (Incorrect)