Physics

Problem

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): [Main 12 April 2020 I] (a)

\frac{2\lambda}{(\mu - 1)}

(b)

\frac{\lambda}{2(\mu - 1)}

(c)

\frac{\lambda}{(\mu - 1)}

(d)

\frac{\lambda}{(2\mu - 1)}