Discuss the conditions for having
(a) interference , (b) maxima and minima.

What are the conditions for sound to interfere ?

List the conditions necessary for sustained interference.

Define interference. List the conditions of obtaining sustained interference.

State one condition for obtaining a sustained interference of light.

State the necessary conditions for the interference of two sound waves.

The ratio of intensities of two waves is 2. the ratio of intensities of maxima and minima when these waves interfere is approximately

When a plane wave front of light, of wavelength lambda , is incident on a narrow slit, an intensity distribution pattern, of the form shown is observed on a screen, suitably kept behind the slit. Name the phenomenon observed. (a) Obtain the conditions for the formation of central maximum and secondary maxima and the minima. (b) Why is there significant fall in intensity of the secondary maxima compared to the central maximum, whereas in double slit experiment all the bright fringes are of the same intensity ? (c) When the width of the slit is made double the original width, how is the size of the central band affected ?

(i) In Young's double slit experiment the condition for (a) constructive and (b ) destructive interference at a point on the screen .

Two coherent sources separated by distance d are radiating in phase having wavelength lambda . A detector moves in a big circle around the two sources in the plane of the two sources. The angular position of n=4 interference maxima is given as

Suppose f(x) is differentiable at x=a . Then , necessary condition for f(x) to possess local maxima or local minima at x=a is