TI-H: Re: PICBASIC-L [ot] physics help!

To: <picbasic-l@qunos.net>
Subject: TI-H: Re: PICBASIC-L [ot] physics help!
From: "ryan pogge" <pogge@shore.intercom.net>
Date: Mon, 1 Mar 1999 19:36:47 -0500
Cc: "stamps" <stamps@parallaxinc.com>, "George Varga" <Vargaur@nucleus.szbk.u-szeged.hu>, "George Varga" <Vargaur.mu.szbk@nucleus.szbk.u-szeged.hu>, "lgaminde" <lgaminde@televar.com>, <paulb@midcoast.com.au>, "pic microcontroller discussion list" <PICLIST@MITVMA.MIT.EDU>, <trinux@ark.com>, <ti-hardware@lists.ticalc.org>
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Anyone here know some physics?
I need a little help.

It has to do with diffracting a laser beam through a double
slit.

you are given the distance between them=1 fringes when the
apparatus is set up
in the air n=1.  you know the distance from the slits to the
viewing screen,
and you know the wavelength of the laser.

need to figure out how much the distance between m=1 fringes
changes
if the entire setup is immersed in a tank of H20(n=1.33).

do the fringes spread beacause the index of refraction is
greater
 or is it more complicated than that?  and how would I
determine the
amount that they spread(or shrink)???

I am totally stumped on this and I know its off topic but
its really important.
Thanks,
Ryan