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In a standard YDSE setup, the fringe wid...

In a standard YDSE setup, the fringe width on the screen is `1.5mm` .When a thin glass film is pasted in front of the upper slit, the fringe pattern shifts up. But it is seen that at a point `P` above central maxima where intensity was one fourth the intensity at central maxima, intensity remains the same. There were no maxima between central maxima and point `P` before film was introduced. What can be the thickness of the film? Take `mu=1.5`, `lambda=450nm`

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