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Young's double slit angles 
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#1
Nov2312, 07:35 PM

P: 746

I am trying to prove that the two θ are equal from this picture
http://en.wikipedia.org/wiki/File:Double_slit.svg How do I go about proving this? 


#2
Nov2312, 07:50 PM

P: 296

This might help: The small triangle's theta refers to the top angle of the triangle, not the left one. Also, the right angle is right. By that I mean that the angle on the right side of the triangle is a 90 degree angle. This post was an excuse to say that the right angle is right.



#3
Nov2612, 12:21 AM

P: 746

Yes I was aware of which angles where which. I just used that picture since it was easily attainable. Any hints as to starting this



#4
Nov2612, 01:03 AM

Mentor
P: 11,864

Young's double slit angles
Suppose you have two lines A and B that have angle θ between them.
If you have line C parallel to A, and line D parallel to B, then C and D also have angle θ between them, right? Likewise, if you have line E perpendicular to A, and line F perpendicular to B, then E and F also have angle θ between them. 


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