How Do You Calculate the Slit Spacing in a Double-Slit Experiment?

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To calculate the slit spacing in a double-slit experiment, the wavelength of the light (590 nm), the distance to the screen (3.42 m), and the total distance of the bright fringes (47 mm) are used. The spacing between the fringes is determined by dividing the total distance by the number of gaps between fringes, resulting in approximately 4.27 mm. The formula d = tL/y is applied to find the slit spacing, yielding a value of 4.73 x 10^-4 m. Clarification on variable labeling and the direction of light propagation was suggested to enhance understanding. The calculation method appears to be correct, but further confirmation is needed.
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Homework Statement


Light from a helium-neon laser (λ=590 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.42 m behind the slits. Twelve bright fringes are seen, spanning a distance of 47 mm. What is the spacing (in mm) between the slits?


Homework Equations





The Attempt at a Solution


t = wavelength

t= 590 nm
L = 3.42 m
y = 47 mm
12 fringes
so the space between 2 fringes would be 47mm/11 = 4.27 mm

d = tL/y = 4.73 x 10^-4 m

I don't have the answer to this problem so is this the right way to do this?
 
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Does anyone know if this is right?
 
BuBbLeS01 said:
Does anyone know if this is right?

your variables are a bit confusin. try labeling them. also, are you saying that the light is coming straight out? (because light doesn't usually stay in a straight beam, does it)
 

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