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In a biprism experiment the fringes are
observed in a focal plane of eyepiece at a
distance of 1 m from the slit. The distance of
30th bright band is measured as 0.6 cm. When a
convex lens is interposed between slit and
eyepiece at a distanced of 20 cm from slit, the
distance between two virtual images observed
is 1.2 mm, what is the wavelength of light.

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