White light is dispersed by a prism. Inside the prism, compared to the blue light, the red light

slows down less and refracts less

Reason — In a prism, the refractive index of a given transparent medium decreases with the increase in the wavelength of light. Thus, for visible light the refractive index of the material of a prism is greater for blue colour and minimum for red colour i.e., speed of red colour is greater than speed of blue colour. Consequently, a given prism deviates blue light more as compared to red light.