Polarizer Glass Filter
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Index of Refraction, Polarization of Light and Lenses?
Briefly explain the role of the following elements used in an Experimental Setup 
a) glass plate, b) filter, c) sugar solution,
d) polarizer.
Why is the rotating arm needed?
Hm, It sounds like you are building a polarimeter.
This device takes a source of light (preferably something like a red laser beam), passes it through a polarizing filter (#1), then through a sugar solution, then through a second polarizing filter (#2).
Before the sugar solution is added between the two filters, the two filters should be aligned the same. When you add the sugar solution, it will actually rotate the beam of light, so that the #2 polarizing filter will have to be rotated to math the beam of light. This rotation is do to the chirality of many organic molecules like sugar.
See the following website for more detail:
http://www.chemistry.adelaide.edu.au/external/soc-rel/content/polarim.htm
here is a website with an animation:
http://scholar.hw.ac.uk/site/chemistry/activity5.asp
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