- #1
talaroue
- 303
- 0
Homework Statement
I have a few questions because of the fact I just don't understand any of this...
1.A helium-neon laser (l=656 nm) illuminates a single slit and is observed on a screen 1.9 m behind the slit. The distance between the first and second minima in the diffraction pattern is 5.45 mm. What is the width (in mm) of the slit?
w=2*(wavelength)*L/a
wavelength= 656 x 10^-9 m
L=1.9 m
a=5.45 x 10^-3 m
The Attempt at a Solution
I plugged and chugged and got 4.574 x 10^-4...what did i do wrong?