first order minima in single slit versus double slit

[erskine]

Quick question: what is the first order minima for a single slit and then for a double slit?

I'm getting confused as to whether the first order minima is when m=1, or if the first order minima is just the first minimum after the central max (in which case it would be m=0.5 for double slit versus 1.5)?

Stupid question and I expect it probably won't matter much but its really irritating me that its confusing me to this extent...

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[Isoprop]

The first min is the min after the first max.
For single slit, n = 1, 2, 3...
So for Young's double slit, m = 0.5, 1.5, 2.5...

 

[erskine]

thanks very much!