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Interference pattern, wavelength

  • Thread starter muffintop
  • Start date
  • #1
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Homework Statement


Suppose the interference pattern shown in the figure is produced by monochromatic light passing through two slits, with a separation of 127 µm, and onto a screen 1.14 m away. What is the wavelength?
28-34.gif



Homework Equations


wavelength = (dsin[tex]\theta[/tex]) / m
y=Ltan[tex]\theta[/tex]


The Attempt at a Solution


[tex]\theta[/tex]= arctan (y/L) = arctan (.023 / 1.4) = .941
then plugged it in to get wavelenth. i used m = 2 for 2 slits
wavelenth = 127 x 10^-6m x sin .941 / 2

i think I have m wrong?
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
i used m = 2 for 2 slits
m is not the number of slits. It is the order of the fringes starting from m=0 for the central bright fringe.
 

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