maccyjj
Mar11-11, 05:56 PM
1. The problem statement, all variables and given/known data
Red plane waves from a ruby laser (694.3nm) in air pass through two parallel slits in an opaque screen. A fringe pattern forms on a distant wall and we see the fourth bright band 1o above the central axis. (Counting the central bright fringe as zero). Calculate the seperation of the slits.
2. Relevant equations
Phase difference \phi2 -\phi1 = (2\pidsin(\theta))/\lambda
Amplitude A2Tot = 2A2(1 + cos(\phi2 -\phi1))
3. The attempt at a solution
I've figured out that when \theta=0 the amplitude is equal to 4A2. I then tried to use this amplitude to find the other maxima (bright bands) but ended up only getting multiples of 2\pi. I think what I'm lacking is knowing the amplitude definition for a bright band. Could someone help?
Red plane waves from a ruby laser (694.3nm) in air pass through two parallel slits in an opaque screen. A fringe pattern forms on a distant wall and we see the fourth bright band 1o above the central axis. (Counting the central bright fringe as zero). Calculate the seperation of the slits.
2. Relevant equations
Phase difference \phi2 -\phi1 = (2\pidsin(\theta))/\lambda
Amplitude A2Tot = 2A2(1 + cos(\phi2 -\phi1))
3. The attempt at a solution
I've figured out that when \theta=0 the amplitude is equal to 4A2. I then tried to use this amplitude to find the other maxima (bright bands) but ended up only getting multiples of 2\pi. I think what I'm lacking is knowing the amplitude definition for a bright band. Could someone help?