89. Find the index of refraction of the liquid filling

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89. Find the index of refraction of the liquid filling the space between the glass plate lying thereon and a plano lens, if viewed in reflected light, the radius of the 7th dark Newton rings was found to be 2,221 mm. The radius of curvature of the convex surface of the lens is equal to 263 cm. Installation illuminated by light with a wavelength of 661 nm. The lens and the plate are made of glass of the same variety.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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