consider a plane monochromatic light wave [wavelength λ,-600 nm) that is incident obliquely at an angle θ on a plane-parallel fabry-perot glass etalon (refractive index n= 1.5) situated in air (refractive index n=1) as shown. the etalon thickness 10 micron (10x10-6m) and the two surface are coated to give identical reflection coefficient r = r, n=1 n=1.5 n=1 (a) sketch the transmission of the etalon as a function of the angle θ, assuming that the reflection coefficient r is such that you get very sharp narrow peaks. (b) calculate the first two non-zero angles (θ1 and θ2) at which the transmission is a maximum. (c) sketch the transmission of the etalon as a function of the angle θ for the case where the incident light is no longer monochromatic, and contains a range of wavelength a2-100 nm centered around 시. explain briefly your sketch