White light is used in a Young's double slit experiment. Find the minimum order of the violet fringe `(lamda = 400 nm)` which overlaps with a red fringe`(lamda = 700 nm)`.

Explanation

Let m be the bright fringe of violet light overlaps with 4th bright fringe of red light. (minimum)
Also, it can be seen that 14th violet frnge wil overlap 8th red fringe
Becaue `m/n=7/4=14/8`