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Limit of Resolution

In a biprism ...

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In a biprism experiment ,the distance between the second and seventh bright fringes on the same side of the central bright fringe is 1.215 mm ,that between the slit and biprism is 20 cm and the distance between the eyepiece and biprism is 130 cm. The magnified and diminished virtual images of the slit for two conjugate positions of a convex lens inserted between the slit and eyepiece are 4.5 mm and 2 mm ,respectively. Find the wavelength of light used.

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