1.

Figure shows two coherent sources `S_(1)-S_(2)` vibrating in same phase. `AB` is an irregular wire lying at a far distance from the sources `S_(1)` and `S_(2)`. Let `(lamda)/d=10^(-3)m,/_BOA=0.12^(@)`. How many bright spots will be seen on the wire, including points `A` and `B`

Answer» Correct Answer - 3
Angular width `=(lamda)/d=10^(-3)` (given)
`:.` No. of fringes within `0.12^(@)` will be
`n=(0.12xx2pi)/(360xx10^(-3))~=[2.09]`
`:.` The number of bright spots will be three.
Hence (B).


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