When a thin transparent sheet is placed in front of a Young's double slit, the fringe-width will

Step-by-step solution

The fringe width in Young's double slit experiment is given by = D d . When a thin transparent sheet of thickness t and refractive index is placed in front of one of the slits, an additional path difference of ( - 1)t is introduced. This causes the entire fringe pattern to shift by a distance y = D d ( - 1)t . The fringe width depends only on the wavelength , the distance between the slits and the screen D , and the distance between the slits d . Since these parameters remain unchanged, the fringe width remains the