Question

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

Answer 1

Answer:

Let mth bright fringe of violet light overlaps with nth bright fringe of red light. => 7th bright fringe of violet light overlaps with 4th bright fringe of red light (minimum). Also, it can be seen that 14th violet fringe will overlap 8th red fringe. Because, m/n = 7/4 = 14/8.