15.
Sodium light l = 589 nm is incident on a Young's double slit experiment. The separation between the two slits is 3.0 mm. If the screen is placed at a distance of 4m from the slits, locate the position of the tenth bright fringe on the screen.
Suggested solution:
The distance xn of the nth bright from the central fringe, in Young's experiment is
Given n = 10: l = 589 10-9m: D=4m d= 2 10-13
= 0.01178 m
= 1.178cm