The central fringe of a interference pattern produced by light of wavelength 6000 Angstrom is found to shift to - Physics - Ray Optics And Optical Instruments

Question

The central fringe of a interference pattern produced by light
of wavelength 6000 Angstrom is found to shift to the position of
4th bright fringe after a glass plate of refractive
index 1 5 is introduced The thickness of the glass plate would be
(in mu-m)
1)4 8
2)8 23
3)14 98
4)3 78

Somnath physics · Accepted Answer

The central fringe of a interference pattern produced by light of wavelength 6000 Angstrom is found to shift to the position of 4th bright fringe after a glass plate of refractive index 1.5 is introduced . The thickness of the glass plate would be (in mu-m) 1)4.8 2)8.23 3)14.98 4)3.78...........