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In double slit experiment fringes are ob...

In double slit experiment fringes are obtained using light of wavelength `4800 Å` One slit is covered with a thin glass film of refractive index. `1.4` and another slit is covered by a film of same thickness but refractive index `1.7`. By doing so, the central fringe is shifted to fifth bright fringe in the original pattern. The thickness of glass film is

A

`2xx10^(-3)` mm

B

`4xx10^(-3)` mm

C

`6xx10^(-3)`mm

D

`8xx10^(-3)`mm

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The correct Answer is:
D
NA
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