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A double column is illuminated with monochromatic light in air and it turns out that the...

A double column is illuminated with monochromatic light in air and it turns out that the first order minima occur at the angles ∓35.09 ° in relation to the reference line from the double column to the central maximum. If the double slit is lowered into a transparent liquid and illuminated with the same light, the first-order minima occur at the angles ± 19.36 °. Determine the refractive index of the liquid.

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