Answer:
The explantion of this question is given below in the explanation section
Step-by-step explanation:
The given problem is about the double slit-experiment problem.
The formula that we will use to figure out problems involving double slit experiments is given below.
Double slit-experiment equation.
λ/d=x/L
Whereas:
λ = wavelength of light used (m)
x = distance from central fringe (m)
d = distance between the slits (m)
n = the order of the fringe
L = length from the screen with slits to the viewing screen (m)
So in the give option L is the distance between A and D