A monochromatic light of wavelength 6500 Å is used in YDSE. Now both slits are covered by two thin slab of refractive index 3.2 and 2.7 respectively. By doing so central bright fringe shifts to original 7^th bright fringe. If both slabs have same thickness then thickness of slab is $\left(in\mu m\right).$  

<p><strong>&nbsp;<span contenteditable="false"> <math> <mrow> <mn>7</mn> <mo>×</mo> <mfrac> <mrow> <mi>D</mi> <mi>λ</mi> </mrow> <mrow> <mi>d</mi> </mrow> </mfrac> <mo>=</mo> <mfrac> <mrow> <mrow> <mo> (</mo> <mrow> <msub> <mrow> <mi>μ</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msub> <mo>−</mo> <msub> <mrow> <mi>μ</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> </mrow> <mo>)</mo> </mrow> <mi>t</mi> <mo>.</mo> <mi>D</mi> </mrow> <mrow> <mi>d</mi> </mrow> </mfrac> </mrow> </math> </span>&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1819022827"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;&nbsp;</strong></p><p>t = 9.1&nbsp;&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1026" DrawAspect="Content" ObjectID="_1819022828"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;&nbsp; <span contenteditable="false"> <math> <mrow> <mi>μ</mi> <mi>m</mi> </mrow> </math> </span></p>

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