Statement I : The fringe obtained at the centre of the screen in known as zeroth order fringe or central fringe. Statement II: Path difference between the waves from `S_1` and `S_2` reaching the centre is zero.

Assertion (A) : The fringe obtained at the centre of screen in known as zeroth order fringe, or the central fringe Reason (R ) : Path difference between the waves from S_(1) and S_(2) , reaching the central fringe (or zero order fringe) is zero

A : In interference, the fringe obtained at the centre of the screen is known as zeroth order fringe, or the central fringe R : In interference, path difference between the waves from S_(1)" and "S_(2) , reaching the central fringe (or zero order fringe) is zero

In double slit experiment, the point on the screen where 3^(rd) order dark fringe from central position is obtained, phase difference between two waves will be .....

Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (lambda=632.8 nm) . The distance between the screen and the slits is 100 cm. If a bright fringes is observed on a screen at a distance of 1.27 mm from the central bright fringe , then the path difference between the waves , which are reaching this point from the slits is close to :

Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (lambda=632.8 nm) . The distance between the screen and the slits is 100 cm. If a bright fringes is observed on a screen at a distance of 1.27 mm from the central bright fringe , then the path difference between the waves , which are reaching this point from the slits is close to :

If the path difference between the interfering waves is n lambda , then the fringes obtained on the screen will be

If the path difference between the interfering waves is n lambda , then the fringes obtained on the screen will be

If white light is used in Young's double -slit experiment a) bright white fringe is formed at the centre of the screen b) fringes of different colours are observed on both sides of central fringe clearly only in the first order c) the first order violet fringes are closer to the centre of the screen than the first order red fringes d) the first order red fringes are closer to the centre of the screen than the first order violet fringes