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RProgrammer
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Homework Statement
http://img225.imageshack.us/img225/3118/photo1587hx4.jpg
This #74 is on the SAT Practice Subject Test in Physics, which is also the Physics test administered in January 2003.
Homework Equations
I don't even know how to begin this problem.
The Attempt at a Solution
I know Young's double-slit equation: nλL=dx
But I don't know any equation for the 'x' and 'y' in the diagram, the distance from the actual slits to the band other than the Pythagorean theorem.
I tried solving with those, and I get a difference, but it's not one of the provided answers.
In my attempt I called the slits A (top) and B (bottom) (since 'x' is the fringe distance), and the distances (x and y in the diagram) Za and Zb.
The system of equations I tried to manipulate was:
Za2=L2 + (d/2 - x)2
Zb2=L2 + (d/2 + x)2
nλL=dx
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