# Young's double slit angles

1. Nov 23, 2012

### Woopydalan

2. Nov 23, 2012

### DocZaius

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. Nov 26, 2012

### Woopydalan

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. Nov 26, 2012

### Staff: Mentor

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.

5. Nov 26, 2012

### sophiecentaur

The phrase 'similar triangles' comes to mind and it hasn't yet been spelled out.