question_answer

In a Young's double slit experiment, the slits are \[2\text{ }mm\]apart and are illuminated with a mixture of two wavelengths \[{{\lambda }_{0}}=750nm\]and\[\lambda =900nm\]. What is the minimum distance (in mm) from the common central bright fringe on a screen 2 m from the slits where a bright fringe from one interference pattern coincides with a bright fringe from the other?

Answer:

4.5