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**1. Homework Statement**

Light of intensity I0 passes through two sets of apparatus.

One contains one slit and the other two slits. The

slits have the same width. What is the ratio of the out

going intensity amplitude for the central peak for the

two-slit case compared to the single slit?

**2. Homework Equations**

The text doesn't give any, I assume it has to do with constructive and destructive interference from the light waves.

**3. The Attempt at a Solution**

Tried using equations for intensity that I've been given from other classes for double and single slit intensity but doesn't really leave me anywhere useful, plus if they're not given in the text then that's probably not the way to go about it. I've also considered superposition.

The answer turns out to be that the intensity of the double slit is larger by a factor of 4 but don't know how to get there

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