A YDSE is performed in a medium of refractive index \( 4 / 3 \). A light of \( 600 \mathrm{~nm} ...

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A YDSE is performed in a medium of refractive index \( 4 / 3 \). A light of \( 600 \mathrm{~nm} \) wavelength is falling on the slits having \( 0.45 \mathrm{~nm} \) separation. The lower slit \( S_{2} \) is covered by a thin glass plate of thickness \( 10.4 \mathrm{~mm} \) and refractive index 1.5 . The Interference pattern is observed on a screen placed 1.5 \( \mathrm{m} \) from the slits as shown in figure (a). Find the location of the central maximum (bright fringe with zero path difference) on the \( y \)-axis.
(a)
(b)
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