Light after passing through two adjacent narrow slits falls on a screeen.Find the exprssion for fringe width.

State two conditions for two light sources to be coherent. Derive an expression for the fringe width in Young.s double slit experiment for interfernce with suitable diagram.

A light of wavelength 1300 A^@ is used to illuminate two slits as a distance of 0.3 mm apart in Young.s double slit experiment. Fringes observed on a screen are found to be 1.3 mm apart. Find the distance of screen from the slits and also find the fringe width if the distance of screen is doubled now.

if one of two identical slits producing interference in Young's experiment is covered with glass, so that the light intensity passing through it is reduced to 50% find the ratio of the maximum and minimum intensity of the fringe in the interference pattern.

What is diffraction of light? Discuss Fraunchofer diffraction of light at a sibgle slit with the help of diagram and deduce expression for width of central maxima, secondary maxima and minima, State the factor on whic fringe width depends.

In Young's double slit experiment,usin light of wavelength 400 nm,interference fringes of width X are obtained .The wavelength of light is increassed to 600 nm and the separation between the slits is halved.If one wants the observed fringe width on the screen to be the same in the two caes,find the rati of the distance between the screen and the plane of the interfering sources in the two arrangements.