Answer Happy

In reality, refractive index of material is not a constant value. Refractive index n has different value for light wavelength w. Because of this feature, light with different wavelength will have different propagation path even they have same incident angle at same position. Below figure shows two light (red and blue) are propagating through material 1 with width L. n, is refractive index for red light, and no is for blue light. Material 2-30 We 1.40 Por 1.50 1 To prevent this path difference, we can use other material(material 2) with width 2L 2L Material Material red 30 redbi = 160 n=1 = 140 M-150 For incident angle a = 30°, calculate refractive index of second material(material 2) for blue light to make two lights together.