The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. The dispersive power of the material is

Step-by-step solution

Given, refractive index for blue light, _ b =1.67 Refractive index for yellow light, _ y =1.65 Refractive index for red light, _ r =1.63 Dispersive power, = ? Dispersive power is the ratio of angular dispersion and mean deviation. The formula of dispersive power is given as aligned &= _ b - _ r _ y -1 &= 1.67-1.63 1.65-1 &= 0.04 0.65 =0.0615 aligned