Two sources S1 and S2 aligned vertically emit polarized waves whose electric fields are perpendicular to the plane of the sheet and come out.

The intensities are respectively: 1 = 200 W/m2 and 2 = 150 W/m2.

The signal coming from source S1 crosses an interface to interfere at point P with the other signal coming from source S2.

The wavelength in vacuum is 0=1 m. In this context,

Calculate the signal strength after transmission. 1= (W/m2)

Calculate the path difference: = (m)

Calculate the resulting intensity at point if 1=2. = (W/m2)