In Young's double slit experiment. yellow light of wavelength 640 nm produces fringes of width 0.8 mm. What will be the fringe width if the light source is replaced by another monochromatic source of wavelength 720 nm and the separation between the slits is made thrice?
1
2.4 mm
2
2.7 mm
3
0.3 mm
4
0.03 mm