In a double-slit experiment, He-Ne laser light of wavelength 633 nm produced an interference pattern on a screen placed some distance from the slits. When one of the slits was covered with a thin glass slide of thickness 12.0 μm, the central bright fringe shifted to the point occupied earlier by the 10th dark fringe (see the figure). What is the index of refraction of the glass slide?

Transcribed Image Text:

Screen Screen Glass slide Central bright fringe St S2 (a) Without the glass slide (b) With glass slide