Double slits

On physics unit 2 jan 2009 paper
Can someone please explain 7b to me?

On physics unit 2 jan 2009 paper
Can someone please explain 7b to me?

Have a look at the picture( the 3rd picture) at this website and see if you can explain.
https://www.itp.uni-hannover.de/~zawischa/ITP/multibeam.html

Here is a youtube video.
https://www.youtube.com/watch?v=GEqwRBjHdwc

Oh thanks the video helped! :smile:

Can white light be regarded as diffraction on double slit anyway? it seems that white light is split up in different light spectra which merge with.

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