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Need help with spacing between slits

  • Thread starter BuBbLeS01
  • Start date
602
0
1. 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?


2. Homework Equations



3. 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???
 

Answers and Replies

602
0
Does anyone know if this is right?
 
53
0
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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