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Interference fringes were produced in Yo...

Interference fringes were produced in Young's double-slit experiment using light of wavelength `5000 Å`. When a film of thickness `2.5xx10^(-3) cm` was placed in front of one of the slits, the fringe pattern shifted by a distance equal to `20` fringe-widths. The refractive index of the material of the film is

A

1,2 and 3 are correct

B

1 and 2 are correct

C

2 and 4 are correct

D

1 and 3 are correct

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Interference fringes were produced in Young's double slit experiment using light of wavelength 5000 Ã…. When a film of material 2.5xx 10^(-3) cm thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 20 fringe widths. The refractive index of the material of the film is

Interference fringes were produced in young's double slit experiment using light of wave length 5000Å ,When a film of material 2.5xx10^(-3) cm thick was placed over over of the slits,the fringe pattern shifted by adistance equal to 20 fringe width.The refractive index of the material of the film is-

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