1. The problem statement, all variables and given/known data
The distance between two slits is 0.05mm and the distance to the screen is 2.5m. What is the spacing between the central bright fringe and the first-order fringe? Use yellow light with a wavelength of 580nm

2. Relevant equations
x_{m}=mλL/d

3. The attempt at a solution
L=0.5mm d=2.5m λ=580nm
x_{m}=(1)(580x10^{-9})/(.5x10^{-3}) = .00116m
(all the numbers were converted to meters)

Whenever I plug these problems in, I get a strange answer that isn't anywhere near the multiple choice answers. What am I doing wrong?

Multiple choice answer possibilities:

Spoiler

a) 0.01m
b) 0.029m
c) 0.29
d) 0.1m
e) 0.6m

I don't want the answer, I want to know what I did wrong here. If you get the right answer, please help!
Cheers,
~a distressed AP student