Two coherent sources `S_1` and `S_2` area separated by a distance four times the wavelength `lambda` of the source. The sources lie along y axis whereas a detector moves along +x axis. Leaving the origin and far off points the number of points where maxima are observed is

Two coherent sources S_(1)" and "S_(2) are separated by a small distance d. The fringes obtained on the screen will be:

Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

An interference is observed due to two coherent sources S_(1) placed at origin and S_(2) placed at (0, 3l, 0). Here, lambda is the wavelength of the sources. Both sources are having equal intensity I_(0) . A detector D is moved along the positive x-axix. Total number of black points observed by the observer on positive x-axis is

Two monochromatic coherent point sources S_(1) and S_(2) are separated by a distance L. Each sources emits light of wavelength lambda , where L gt gt lambda . The line S_(1) S_(2) when extended meets a screen perpendicular to it at point A. Then