Given:Difference in the refractive indices of violet and red lights = 0.014Let μv and μr be the refractive indices of violet and red colours.Thus, we have:μv​ −μr​= 0.014Now,Real depth of the newspaper = 2.00 cmApparent depth of the newspaper = 1.32 cmRefractive index =Apparent depthReal depth​ Refractive index for yellow light (μy​) is given byμy​ =1.322.00​=1.515Also,Dispersive power, ω=μy​−1μv​−μr​​=1.515−10.014​Or, ω=0.5150.014​=0.027 Thus, the dispersive power of the material is 0.027.