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Fringes are produced with monochromatic light of wavelength 5500 Å. A thin glass plate of R.I. 1.5 is then placed normally in one of the paths of interfering beams and the central bright fringe is found to be shifted to the position, previously occupied by the third bright band from the centre. the thickness of the glass plate is

A

`33xx10^(-4)m`

B

`16.5xx10^(-7)m`

C

`33xx10^(-7)m`

D

`33xx10^(-5)m`

Text Solution

Verified by Experts

The correct Answer is:
C
No. of fringes shifted, `N=((n-1)t)/(lamda)`
`therefore 3=((1.5-1)t)/(5.5xx10^(-7))=(t)/(11xx10^(-7))`
`therefore t=33xx10^(-7)m`
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