Advanced physics

7. [2] Two flat plates of glass plates touch at one end but are held apart by a thin nylon filament at the other end. When the plates of glass are illuminated with normally incident light from a sodium lamp of yellow light over a very narrow range of wavelengths, evenly spaced dark bands are observed. If the nylon filament were moves closer to the edge at which the glass plates touch. (i) the dark bands spread further apart (ii) the dark bands move closer together (lib) the dark bands do not change position. 8. [8] Green light of wavelength son