5. The figure below shows a slab made of three different materials X, Y and Z having refractive indices nx, ny, and nz respectively. The slab is immersed in water (n=1.333) and the light is incident upon its bottom surface. water water a. Rank the materials according to the refractive index of the materials, greatest first. (2 points) 5. a. According to the refractive index -> n x > nz > ny or nx, no, ny - The refractive index OF material x is greater than or equal to the refractive index OF material & which is greater than the refractive index OF material y who got the least among the three . b. Rank the materials according to the speed of light in the material, greatest/fastest first. (2