A beam of light consisting of two wavelengths 6500A˚ and 5200A˚ is used to obtain interference fringes in YDSE. The distance between slits is 2 mm and the distance of the screen from slits is 120 cm. What is the least distance from central maximum where the bright due to both wavelengths coincide?
a. 0.156 cm
b. 0.312 cm
c. 0.078 cm
d. 0.468 cm