Two slit interference pattern

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http://img504.imageshack.us/img504/3341/img186je6.th.jpg [Broken]

Above is an image scanned in from my textbook of an interefernce pattern from two slits.

Am I correct in thinking that the distance between the maxima within the main envelope is found via λ = ws/D , where w = this distance?

Also, would the minima of the main envelope be found using dsin(theta)= nλ?


How would should a pattern physically be seen? Would the brighter regions have a series of darker regions within them?

Thanks!
 
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Redbelly98
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What are d, D, and s?
 

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