In an experimental arrangement of a Fresnel' biprism, monochromatic light of wavelength λ is used to produce interference fringe pattern. On introducing a thin, transparent glass sheet of refractive index 1.50 and thickness of 7 microns in the path of one of the interfering beams, the central fringe of the pattern is shifted to the position of 6th bright fringe. Then, the wavelength λ of the monochromatic light used is nearly:

In an experimental arrangement of a Fresnel' biprism, monochromatic li

1.	In an experimental arrangement of a Fresnel' biprism, monochromatic light of wavelength λ is used to produce interference fringe pattern. On introducing a thin, transparent glass sheet of refractive index 1.50 and thickness of 7 microns in the path of one of the interfering beams, the central fringe of the pattern is shifted to the position of 6th bright fringe. Then, the wavelength λ of the monochromatic light used is nearly:
A.	55 nm
B.	650 nm
C.	618 nm
D.	583 nm
Answer» E.

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