In the double-slit experiment, the distance of the second dark fringe from the central line are `3 mm`. The distance of the fourth bright fringe from the central line is

In the Youngs double slit experiment, the distance of pth dark fringe from the central maximum

In a biprism experiment, the distance of the 7th dark band from the central bright band is 2.6 mm. the width of the fringe is

In Young's double slit experiment, the distance between two coherent sources is 1 mm and the distance between the slits and the screen is 1 m. If the 10th dark fringe is at a distance of 4.75 mm from the central bright fringe, calculate the distance of 5th bright fringe from the central bright fringe.

In a biprism experimentn the distance between second and eight dark fringes on the same side of central bright fringe is 3 mm. The fringe width is