Microwaves of intensity I =100 W/m^2 and wavelength 2. =1cm are emitted by an antenna located in S at 500 m above the 1 km level of a frozen lake (n = 1.31). A P-antenna S P receives both a wave that propagates 500 m horizontally and a wave that is reflected from 45" the icy lake. If the OEM is linearly polarized with y i = 90 degrees, determine the intensity in P and say whether there is constructive or destructive interference