# Double Slit Diffraction Problem

## Main Question or Discussion Point

I had this problem on my exam and I was pretty sure i knew what to do but it couldn't come up with the right answers.
I diagrammed the problem and showed the way i tried to solve it in blue. Can someone tell me where i went wrong? Basically i found the length the of the first maximum off the center. i used Pythagorean's theorem to find D2. Then subtracted the two distances to find the difference. I then took the arctan of that distance divided by D1.

Related Other Physics Topics News on Phys.org
Simon Bridge
Homework Helper
You way over-thought the problem.
Start from the physics: what is the condition that makes a maximum?

the center of a maximum is complete constructive interference from two rays of light?

Simon Bridge
Homework Helper
the center of a maximum is complete constructive interference from two rays of light?
... good - so what is the condition for constructive interference in terms of the path lengths?

wouldn't it be the wavelength plus by any integer being multiplied by the wavelength?

Simon Bridge