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Determining wavelength of double slit experiment

  • Thread starter mitch987
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Homework Statement


If i have the intensity pattern of a double slit experiment and aim to find the wavelength of the monochromatic light incident on the slits with the following information,
- width of each slit
- distance to the screen
- intensity pattern (displacement Vs intensity)

Homework Equations


for double slit (bright fringes):
sin [tex]\theta[/tex] = [tex]\frac{m \lambda}{d}[/tex]

where m is the order of the bright fringe, d is the slit separation

for single slit (dark fringes):
sin [tex]\theta[/tex] = [tex]\frac{m \lambda}{a}[/tex]

where m is the order of the dark fringe, a is the slit width

The Attempt at a Solution


Since the double slit intensity pattern is modulated by the single slit intensity pattern is it possible to use the single slit equation and let a = the slit width?
Since for the double slit equation i have an unknown [tex]\lambda[/tex] and unknown d (slit separation).

any help would be greatly appreciated.
Thanks,

Homework Statement





Homework Equations





The Attempt at a Solution

 

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