question_answer

A beam of light consisting of two wavelength \[6500\,\overset{o}{\mathop{A}}\,\] and \[5200\,\overset{o}{\mathop{A}}\,\]is used to obtain interference fringes in a young's double slit experiment. The distance between the slits is 2.0 mm and the distance between the plane of the slits and the screen is 120 cm. What is the least distance from the central maximum where the bright fringes due to both the wave length coincide?

A) 0.156 cm

B) 0.152 cm

C) 0.17 cm 

D) 0.16 cm