In young's experiments ,the source of re...

In young's experiments ,the source of red light of wavelength `7xx10^(-7)m` when a thin glass plate of refrative index `1.5` at this wavelength is put in the path of one of the interfering beams,the central bright fringe shifts by `10^(-3)` m to the position previously occupied by the `5th` bright fringe,Find the thickness of the plates. When the sources is now change to green light of wavelenght `5xx10^(-7)`m ,the central fringe shifts to a position initially occupied by the `6th` bright fringe due to red light,Find the refractive index of glass for the green light .Also estimate the changes in fringe width due to the change in wavelength

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The correct Answer is:

`[1.6,5.7 xx 10^(-5)m]`

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