Four identical monochromatic source A, B, C, D as shown in figure produce waves of the same wavelength `lambda` and are coherent. Two receivers `R_(1)` and `R_(2)` are at great but equal distance from B. The choose the correct statements.

Four identical monochromatic sources A,B,C,D as shown in the (figure) produce waves of the same wavelength lambda and are coherent. Two receiver R_(1) and R_(2) are at great but equal distances from B. (i) Which of the two receivers picks up the larger signal when B is turned off? (iii) Which of the two receivers picks up the larger singnal when D is turned off ? (iv) Which of the two receivers can distinguish which of the sources B or D has been turned off ?

Four identical coherent sourc e emiting monochromatic light if same wavelength lambda are placed at A,B,C and D as shown. Two receivers R_(1) and R_(2) are at but equal distance from B. The path difference between signals reaching from A&D at R_(1) is (lambda)/(2) and between signals reaching from A & B at R_(2) is ~= 0 . Also assume that intensities of waves emitted by A,B,C &D reaching at R_(1) and R_(2) is same.

Four identical coherent sourc e emiting monochromatic light if same wavelength lambda are placed at A,B,C and D as shown. Two receivers R_(1) and R_(2) are at but equal distance from B. The path difference between signals reaching from A&D at R_(1) is (lambda)/(2) and between signals reaching from A & B at R_(2) is ~= 0 . Also assume that intensities of waves emitted by A,B,C &D reaching at R_(1) and R_(2) is same.

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