Physics

Problem

[Jan. 31, 2023 (II)] In Young's double slit experiment, two slits

S_1

and

S_2

are 'd' distance apart and the separation from slits to screen is D (as shown in figure). Now if two transparent slabs of equal thickness 0.1 mm but refractive index 1.51 and 1.55 are introduced in the path of beam (

\lambda = 4000\text{Å}

) from

S_1

and

S_2

respectively. The central bright fringe spot will shift by ______ number of fringes. [Jan. 30, 2023 (I)] ![Diagram illustrating Young's double slit experiment setup. Slits S1 and S2 are separated by distance d. The distance from the slits to the screen is D. A point P is shown on the screen. A transparent slab of thickness 0.1 mm and refractive index 1.51 is placed in the path of the beam from S1 to P. A transparent slab of thickness 0.1 mm and refractive index 1.55 is placed in the path of the beam from S2 to P.](https://storage.googleapis.com/diraq-contents/homework-question-parsing/marker/20260106T182719Z/aae478035deb4109b50a9e9c2f0a91ae/64662465bba247703fdec49c8f3309f9_img.jpg)

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