When a thin plate of refractive index 1.5 is placed in the path of one – McqOptions

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1.	When a thin plate of refractive index 1.5 is placed in the path of one of interfering beams of Michaelson Interferometer, a shift of 30 fringes is observed. If the thickness of plate is 0.018 mm, the wavelength of the used light is ____
A.	4000
B.	5000
C.	6000
D.	7000
Answer» D. 7000

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