For constructive interference, the phase difference (in radian) between the two waves should be

If $\lambda \backslash lambda$ is the wavelength of light used in Young’s double-slit experiment, the path difference for a phase difference of 11$\pi \backslash pi$ rad is

The fringe width in an interference pattern is W. The distance between the 6th dark fringe and the 4th bright fringe on the same side of the central bright fringe is

In an interference pattern using two coherent sources of light, the fringe width is

Two slits, 2 mm apart, are placed 300 cm from a screen. When light of wavelength 6000 Å is used, the separation (in mm) between the successive bright lines of the interference pattern is

In two separate setups of Young’s double-slit experiment, the wavelengths of the lights used are in the ratio 1 : 2 while the separation between the slits are in the ratio 2 : 1. If the fringe widths are equal, the ratio of the distances between the slit and the screen is

In Young’s double-slit experiment, the slit separation is reduced to half while the distance of the screen from the slits is increased by 50%. In terms of the initial fringe width, W, the new fringe width is,

A pair of slits 1.5 mm apart is illuminated with monochromatic light of wavelength 5500 Å and the interference pattern is obtained on a screen 1.5 m from the slits. The least distance of a point from the central maximum where the intensity is minimum is

In Young’s double-slit experiment, if a thin transparent sheet covers one of the slits, the optical path of the wave from that slit

In Young’s double-slit experiment, if a thin mica sheet of thickness t and refractive index $n_{m}n\_m$ covers one of the slits, the optical path of the wave from that slit