Monochromatic light passes through an orifice in a screen Sc (Fig. 5.17) and being reflected from a

Question:

Monochromatic light passes through an orifice in a screen Sc (Fig. 5.17) and being reflected from a thin transparent plate P produces fringes of equal inclination on the screen. The thickness of the plate is equal to d, the distance between the plate and the screen is l, the radii of the ith and kth dark rings and ri, and are rk. Find the wavelength of light taking into account that ri, k