The figure shows a Mach-Zehnder interferometer: a ray of light strikes a beam splitter (BS1) and is divided into two beams, one reflected and the other transmitted, of equal intensity. Each of the two beams is then reflected by one of the mirrors (M1 and M2) and reaches a second beam splitter (BS2).Note the different arrangement of the two materials in the two separators BS1 and BS2 and determine whether the light exits from the separator BS2 upwards, to the right, or in both direction

A thin glass plate, with refractive index n = 1.50, is inserted in the horizontal path before the separator BS2.What is the smallest plate thickness, greater than 1.0 ?m, for which a monochromatic light of wavelength 570 nm only exits the BS2 separator upwards?The thickness of the glass plate of the previous question is d = 2.7 ?m; Is the light that comes out of the separator BS2 to the right or the one that comes out upwards more intense?