In Young's double slit experiment the point source is placed slightly off the central axis as shown in figure. The plane of slits (S_(1), S_(2)) and screen are separated by a distance of 2m. The separation between the slits is 10 mm. The position of the slit above the axis is 1mm. if the wavelength lambda = 4000 Å in the above arrangement If central maximum is to occur at point 'P' then a sheet of thin film of refractive index mu = 1.5 can be introduced in the path of rays from one the slits to the point 'P'. (t-thickness of film)

In Young's double slit experiment the point source is placed slightly

1.	In Young's double slit experiment the point source is placed slightly off the central axis as shown in figure. The plane of slits (S_(1), S_(2)) and screen are separated by a distance of 2m. The separation between the slits is 10 mm. The position of the slit above the axis is 1mm. if the wavelength lambda = 4000 Å in the above arrangement If central maximum is to occur at point 'P' then a sheet of thin film of refractive index mu = 1.5 can be introduced in the path of rays from one the slits to the point 'P'. (t-thickness of film)
Answer» <P>`S_(1)` to P such that `[S S_(1) + S_(1)P+(MU - 1)t] ~ [S S_(2) + S_(2)P] = 0` `S_(2)` to P such that `[S S_(2) + S_(2)P+(mu - 1)t] ~ [S S_(1) + S_(1)P] = 0` `S_(1)` to P such that`[S S_(2) + S S_(1)] ~ [S_(1)P + (mu - 1)t + S_(2)P] = 0` `S_(1)` to P such that`[S S_(1) + S S_(2)] ~ [S_(1)P + (mu - 1)t + S_(1)P] = 0` ANSWER :A

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