Monochromatic light is passed through a double slits, with separation between the slits, 0.5 mm and interference pattern is observed on a screen 2.5 m away. The first bright fringe is formed 2 mm away from central fringe. What is the wavelength of light?

360 nm 380 nm 400 nm 420 nm

400 nm

The correct answer is Option (3) → 400 nm