Manufacturer apparatus manual hosted by IIT Roorkee. Cover credits Raman Scientific Instruments, Roorkee. PDF pp2–5 describe the sodium source, slit, biprism, optical bench, micrometer eyepiece, two virtual slit images and fringe-width relation. PDF p2 gives the conjugate-lens separation method: the full virtual-source separation is the square root of the product of the two measured image separations. The manual denotes that full separation by2d; this differs from conventions using d for the full separation.

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