Two source S1 and S2 of intensity I1 and I2 are placed in front of a screen [Fig. 10.3 (a)]. The patteren of intensity distribution seen in the central portion is given by Fig. 10.3 (b). In this case which of the following statements are true.
(a) S1 and S2 have the same intensities.
(b) S1 and S2 have a constant phase difference.
(c) S1 and S2 have the same phase.
(d) S1 and S2 have the same wavelength.