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Width of Slit...HeLP on setup Please!
A helium-neon laser (λ=590 nm) illuminates a single slit and is observed on a screen 1.7 m behind the slit. The distance between the first and second minima in the diffraction pattern is 6.78 mm. What is the width (in mm) of the slit?
I think I am supposed to use the equation...
W = 2tL/a
t = wavelength
t = 0.00000059 m
L = 1.7 m
a = .00678 m
but that gets me 0.2956 mm
If I divide that by 2 I get the right answer so I am a little confused on my setup
Homework Statement
A helium-neon laser (λ=590 nm) illuminates a single slit and is observed on a screen 1.7 m behind the slit. The distance between the first and second minima in the diffraction pattern is 6.78 mm. What is the width (in mm) of the slit?
Homework Equations
The Attempt at a Solution
I think I am supposed to use the equation...
W = 2tL/a
t = wavelength
t = 0.00000059 m
L = 1.7 m
a = .00678 m
but that gets me 0.2956 mm
If I divide that by 2 I get the right answer so I am a little confused on my setup