In a Youngs double slit experiment, an angular width of the fringe is \( 0.35^{\circ} \) on a sc...

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In a Youngs double slit experiment, an angular width of the fringe is \( 0.35^{\circ} \) on a screen placed at \( 2 \mathrm{~m} \) away for particular wavelength of \( 450 \mathrm{~nm} \). The angular width of the fringe, when whole system is immersed in a medium of refractive index \( 7 / 5 \), is \( \frac{1}{\alpha} \). The value of \( \alpha \) is
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