In the arrangement shown in Fig., slits `S_(1)` and `S_(4)`are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of `S_(1) S_(2)` and `S_(3) S_(4)`.

The minimum value of Z for which the intensity at O is zero is

In the arrangement shown in Fig., slits S_(1) and S_(4) are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S_(1) S_(2) and S_(3) S_(4) . When Z = (lambda D)/(2d) , the intensity measured at O is I_(0) . The intensity at O When Z = (2 lambda D)/(d) is

In the arrangement shown in Fig., slits S_(1) and S_(4) are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S_(1) S_(2) and S_(3) S_(4) . When Z = (lambda D)/(2d) , the intensity measured at O is I_(0) . The intensity at O When Z = (2 lambda D)/(d) is

In the arrangement shown in Fig., slits S_(1) and S_(4) are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S_(1) S_(2) and S_(3) S_(4) . If a hole is made at O' on AO' O and the slit S_(4) is closed, then the ratio of the maximum to minimum observed on screen at O , if O' S_(3) is equal to (lambda D)/(4d) , is

In the arrangement shown in Fig., slits S_(1) and S_(4) are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S_(1) S_(2) and S_(3) S_(4) . If a hole is made at O' on AO' O and the slit S_(4) is closed, then the ratio of the maximum to minimum observed on screen at O , if O' S_(3) is equal to (lambda D)/(4d) , is

In arrangement shown in figure, plane wavefront of monochromatic light of wavelength lamda is incident on identical slits S_(1) and S_(2) . There is another pair of indentical slits S_(3) and S_(4) which are having separation Z = (lamda D)/(2d) Point O is on the screen at the common perpendicular bisector of S_(1)S_(2) and S_(3) S_(4).I_(1) is the intensity at point O Now the board having slits S_(3)S_(4) is moved upward parallel to itself and perpendicular to line AO till slit S_(4) is on line AO and it is observed that now intensity at point O is I_(2) then (I_(2))/(I_(1)) is :

In arrangement shown in figure, plane wavefront of monochromatic light of wavelength lamda is incident on identical slits S_(1) and S_(2) . There is another pair of indentical slits S_(3) and S_(4) which are having separation Z = (lamda D)/(2d) Point O is on the screen at the common perpendicular bisector of S_(1)S_(2) and S_(3) S_(4).I_(1) is the intensity at point O Now the board having slits S_(3)S_(4) is moved upward parallel to itself and perpendicular to line AO till slit S_(4) is on line AO and it is observed that now intensity at point O is I_(2) then (I_(2))/(I_(1)) is :

Parallel monochromatic beam is falling normally on two slits S_(1) and S_(2) separated by d as shown in figure. By some mechanism, the separation between the slits S_(3) and S_(4) can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of S_(1)S_(2) and S_(3)S_(4) . When z=(Dlambda)/(2d) , the intensity measured at P is I. and when z is equal to (4Dlambda)/(d) , Intensity is x l. Find x.

Consider the arrangement shown in figure. By some mechanism, the separation between the slits S_3 and S_4 can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of S_1 S_2 and S_3 S_4 . When z=(Dlambda)/(2d) , the intensity measured at P is I. Find the intensity when z is equal to (a)(Dlambda)/d (b)(3Dlambda)/(2d) (c) (2Dlambda)/d .