Q8. Hi please help with each question in photo. Will give thumbs up thanks!

A physicist is carrying out an experiment to determine the Index of refraction for a partially reflective material. To do this, he aims a narrow beam of light at a sample of this material, which has a smooth surface. He then varies the angle of incidence. (The incident beam is traveling through air.) The light that gets reflected by the sample is completely polarized when the angle of Incidence Is 57.0. (a) What index of refraction describes the material? n = (b) If some of the incident light (at 0, = 57.09) enters the material and travels below the surface, what is the angle of refraction (in degrees)? A Young's double-slit experiment is performed with three different colors of light: red, green, and blue. Rank the colors by the distance between adjacent bright fringes, from smallest to largest. O green, blue, red O red, green, blue blue, green, red