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VITEEE 2016 Solved Paper

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Question : 35

Total: 125

When a plastic thin film of refractive index 1.45 is placed in the path of one of the interfering waves then the central fringe is displaced through width of five fringes. The thickness of the film, if the wavelength of light is 5890 Å, will be

6.544 X 10−4 cm
6.544 x 10−4 m
6.54 x 10−4 cm
6.5 x 10−4 cm

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