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In a Young’s double slit arrangement the screen is 1.0 m away from the double slits...

In a Young’s double slit arrangement the screen is 1.0 m away from the double slits which are 1.8 mm apart. If light of 546 nm wavelength is used, find the separation of the fringes on the screen. A glass chamber filled with air is placed before the upper slit S 2. The air is then replaced with a gas, whereupon the fringe pattern is seen to be displaced by 14 bright fringes. If the chamber’s internal length is 16 mm, find the refractive index of the gas, ng, given the refractive index of air is 1.000275. In which direction is the fringe pattern moved?

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