the optical activity of sugar help in determining the content of sugar in...mcq physics
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Answer:
The temperature changes it's optical activity. This depends on the wavelength of light used and the substance. From my own personal experience, a 633nm laser will result in little change in optical activity. A green (546.1nm) has a much more easily measurable change (if you are doing a lab).
We have the equation
[α]=αlc
where [α] is the specific rotation (at a specific temperature and wavelength), α is the observed rotation, l is the path length (through the sugar water), and c is the concentration (in this case the sugar).
I'm not exactly sure why temperature changes the specific rotation, but my best guess (from experiments that I have done) is that temperature changes the polarization of the substance. (Should make sense if you think of how water interacts with light at different temperatures) Our above equation is sometimes written as
[α]Tλ=αlc
Where T is temperature and λ is the wavelength. So the only thing that can change in here is the original polarization of the substance.
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