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Biprism is kept 10 cm away from slit illuminated by monochromatic light of wavelength 5896 Å. The width of the fringes obtained on a screen placed at a distance of 90 cm from biprism is 0.0009 cm. what is the distance between two coherent source? *​

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Answer:

A narrow slit , ILLUMINATED by a monochromatic SOURCE of wavelength 5896 xx 10^(-10) m is placed at a DISTANCE of 5 cm from a biprism . The virtual images formed by the biprism are 1 mm apart . Find the fringe-width on a screen placed 95 cm in front of the biprism



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