The inclined faces of a glass biprism (µ = 1.5) make an angle of 1° with its base. The
biprism is illuminated by a sodium lamp (λ = 589 nm) and the eye piece is at a
distance of 1 m from the slit. A convex lens inserted between the biprism and the eye
piece gives clear images of coherent sources in the focal plane of the eye piece. If the
images are 0.4 cm apart in one case and 0.16 cm apart in the second case, calculate
the width of interference fringes observed on the screen.
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