When a ray of white light passes through a glass prism, it splits into its constituent spectral colors due to dispersion. Which color deviates the least during this refraction process?

💡 Solution & Explanation

Red light deviates the least because it has the longest wavelength and the lowest refractive index in glass among the visible spectrum components, causing it to bend minimally according to Snell law. Conversely, violet light has the shortest wavelength and highest refractive index, leading to the maximum deviation. A closely related physical application is that red light is chosen for danger signals because it scatters the least through dust and fog due to its long wavelength.