In Young's double-slit experiment,if a metal plate of thickness $t$ is placed in the path of one of the rays,then:

$A$ Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

In Young's double slit experiment,the slits are $0.5\, mm$ apart and interference pattern is observed on a screen placed at a distance of $1.0\, m$ from the plane containing the slits. If the wavelength of the incident light is $6000\ \mathring A$,then the separation between the third bright fringe and the central maxima is......$mm$.

In Young's double-slit experiment,the width of one slit is twice that of the other. What is the ratio of the maximum to the minimum intensity?

In a Young's double slit experiment,the central point on the screen is

In a Young's double-slit experiment,the separation of the two slits is doubled. To keep the same spacing of fringes,the distance $D$ of the screen from the slits should be made