JEE · NEET Previous Year Question

In Young’s double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelength ${\lambda }_1$ = 12000 Å and ${\lambda }_2$ = 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

Topic: NEET PYQ

Answer: A. Full step-by-step solution below.