Fringes are produced by a Fresnel's biprism in focal plane of a reading microscope which is 100cm from the slit. A lens inserted between the biprism and the eyepiece gives two images of the slit in two positions of the lens. In one case the two images of the slit are 0.45 mm apart in the other case 2.90 mm apart. If sodium light of wavelength 5893Å used, find the width of the interference fringes. If the distance between the slit and biprism is 10cm and refractive index of the material of the biprism is 1.5, calculate the angle in degrees which the inclined faces of the biprism makes with its base.

Fringes are produced by a Fresnel's biprism in focal plane of a readin

1.	Fringes are produced by a Fresnel's biprism in focal plane of a reading microscope which is 100cm from the slit. A lens inserted between the biprism and the eyepiece gives two images of the slit in two positions of the lens. In one case the two images of the slit are 0.45 mm apart in the other case 2.90 mm apart. If sodium light of wavelength 5893Å used, find the width of the interference fringes. If the distance between the slit and biprism is 10cm and refractive index of the material of the biprism is 1.5, calculate the angle in degrees which the inclined faces of the biprism makes with its base.
Answer» ANSWER :[2.91 or 1.73 MM]

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