A single beam of coherent light (λ = 633·10-9 m) isincident on two glass slides (with a refractive index of 1.50),which are touching at one end and are separated by a d =0.0247-mm thick sheet of paper on the other end, as shown in thefigure. Beam 1 reflects off the bottom surface of the top slide,and Beam 2 reflects off the top surface of the bottom slide. Assumethat all the beams are perfectly vertical and that they areperpendicular to both slides, i.e., the slides are nearly parallel(the angle is exaggerated in the figure); the beams are shown atangles in the figure so that they are easier to identify. Beams 1and 2 recombine at the location of the eye in the figure. Theslides are L = 8.31 cm long and D = 1.05 mmthick.
a) At what position does the first bright fringe appear?
