In a double slit experiment, when a thin film of thickness t having refractive index $\mu $. is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is ($\lambda $ is the wavelength of the light used) :

Question

${\lambda \over {2\left( {\mu - 1} \right)}}$

${\lambda \over {\left( {2\mu - 1} \right)}}$

${{2\lambda } \over {\left( {\mu - 1} \right)}}$

${\lambda \over {\left( {\mu - 1} \right)}}$

Solution

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