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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

`2 xx 10^(-3)` m m

B

`4 xx 10^(-3) ` m m

C

`6 xx 10^(-3) m m `

D

`8 xx 10^(-3) m m `

Text Solution

Verified by Experts

The correct Answer is:
D
`n lambda = (mu_(2) - mu_(1))t , 5 beta = (mu_(2) - mu_(1)) "t" (beta)/(lambda)`
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