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In a double slit experiment, when a thin film of thickness t having refractive index μ . 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 ( λ is the wavelength of the light used) :

1. ) 1 ( 2 − μ λ
2. ) 1 2 ( − μ λ
3. ) 1 ( 2 − μ λ
4. ) 1 ( − μ λ

Correct answer: ) 1 ( − μ λ

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