In Young's double slit experiment, if one of the slit is closed fully, then in the interference pattern

In Young's Double slit Experiment, if one of the slits is closed, what happens?

In a Young's double-slit experiment, green light is incident on the two slits. The interference pattern is observed on a screen. Which one of the following changes would cause the observed fringes to be more closely spaced?

In a Young's experiment, the width of one of the two slits is double the other, then interference

In Young's double slit experiment, the ratio of intensity at the maxima and minima in the interference pattern is 25 : 9 . What is the ratio of the widths of the two slits ?

In Young's double sllit experiment, What in the effect on the interference pattern if, One of the slits in covered with translucent paper.

In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.

In Young's double sllit experiment, What in the effect on the interference pattern if, The distance between the screen and the plane of slits is doubled.