Fringes are formed by a Fresnel’s bi-prism in the focal plane of a reading microscope, which is 100 cm from the slit. A lens inserted between the biprism and the microscope gives two images of the slit in two positions. In one case the two images of the slit are 4.050 mm and in other, they are 2.900 mm apart. If the sodium light (λ=589.3 nm) is used, find the distance between the interference fringes.

Fringes are formed by a Fresnel’s bi-prism in the focal plane of a r

1.	Fringes are formed by a Fresnel’s bi-prism in the focal plane of a reading microscope, which is 100 cm from the slit. A lens inserted between the biprism and the microscope gives two images of the slit in two positions. In one case the two images of the slit are 4.050 mm and in other, they are 2.900 mm apart. If the sodium light (λ=589.3 nm) is used, find the distance between the interference fringes.
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