For a long pass filter, the substrate has a refractive index of 1.52 (the reference wavelength is 520 nm, the admittances of quarterwave layers H, M, and L are 2.34, 1.79, and 1.38). An antireflection coating is coated on the second surface (a) Calculate the reflectance without coating. What is the optimal single layer coating (refractive index and thickness of the material) to reduce the reflectance to 0%? (b) For a V-coat Air LM|Glass, the reflectance is plotted below. How would you be able to add ne additional layer to reduce the reflectance to