Write clearly please

Two glass slides (with n=1.5) are separated on one end by a piece of gold foil. The gold foil has a thickness d = 12 um. Monochromatic and coherent light is shining down on the setup, which is creating bright and dark fringes when viewed from above. IIIIII X (a) At the far right side of the setup (where the two slides are in contact, where r = 0), is there a dark or bright fringe? Why? (b) Assume the light illuminating the slides has wavelength A = 700 nm (red light). How many bright fringes are there? (c) How far from the right side (x =?) would you find the 8th bright fringe? (d) If the illuminating light were instead violet (A = 100 nm), where would the 8th bright fringe be? (e) Assume we're using the red light again (A = 700 nm). If we submerge the whole apparatus into water (i.c. the space between the slides is filled with water, n=1.33), how many bright fringes would you see