# Slit pattern, vertical or horizontal?

by lightconstant
Tags: slit experiment
 P: 8 This has already been asked: http://www.physicsforums.com/showthread.php?t=77835 It is a simple question but I am confused, if the slit or the slits are vertical the direction of the pattern is horizontal or vertical? Vertical: | | | | | | | | | | Or horizontal like in this video: http://www.youtube.com/watch?v=tu57B1v0SzI | | || | | | | | At the left is the two slits and at the right the pattern, the first one in the same direction of the slits vertical and the second one horizontal (It should go inside the screen) but It is hard to draw Which one is it?
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P: 11,749
 Quote by lightconstant Or horizontal like in this video: http://www.youtube.com/watch?v=tu57B1v0SzI
The bright and dark bands are each oriented vertically, parallel to the slit(s), but they are spread out in a horizontal pattern, perpendicular to the slit(s). This is how I would describe the patterns shown from about 1:00 onwards in that movie.
P: 8
 Quote by jtbell The bright and dark bands are each oriented vertically, parallel to the slit(s), but they are spread out in a horizontal pattern, perpendicular to the slit(s). This is how I would describe the patterns shown from about 1:00 onwards in that movie.

Well expressed jtbell so is that what it happens or should it be rotated 90 degrees like:

The bright and dark bands are each oriented horizontally, perpendicular to the slit(s), but they are spread out in a vertical pattern parallel to the slit(s)?

 P: 8 Slit pattern, vertical or horizontal? please can someone answer my question?
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P: 11,749
 Quote by lightconstant so is that what it happens
Yes, it happens the way I described it. I've seen it many times in undergraduate labs during the past 25+ years.

(not the single-photon-at-a-time version, but rather shining a laser beam through slits.)
 P: 8 Thank you jtbell

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