1.

In Young.s double slit experiment the point source placed slightly off the central axis as shown in figure .The plane of slits (S_(p)S_(2)) and screen are separated by a distanceof 2m . The separation between the slits is 10 mm . The positionof the slitabove the axis is I mm . If the wavelength lambda = 4000 A^(0) in the above arrangement(##AKS_TRG_AO_PHY_XII_V02_C_C04_E03_031_Q01.png" width="80%"> If centralmaximum is to occur of rays from one of the slits to the point .P. ( t - thickness of film )

Answer»

<P>`S_(1) `to P such that `[SS_(1) +S_(1)P(mu-1)t]-[SS_(2)+S_(2)P]=0`
`S_(2)` to P such that `[SS_(2) +S_(2)P + (mu-1)t] - [SS_(1)+S_(1)P] = 0`
`S_(1)` to P such that `[SS_(2) +SS_(1)]- [S_(1)P+(mu-1)t+S_(2)P]=0`
`S_(1)` to P such that `[SS_(1)+SS_(2)]-[S_(1)P+(mu-1)t+S_(1)P]=0`

ANSWER :A


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