The discussion revolves around the relationship between the refractive index of glucose solutions and their concentrations. Participants are exploring how the refractive index changes with varying concentrations of glucose.
Participants are actively engaging with the topic, with some guidance provided regarding the use of the speed of light in a vacuum for calculations. There is an ongoing exploration of the relationship between concentration and refractive index, but no consensus has been reached yet.
Participants are discussing the implications of using different reference points for the speed of light and the accuracy required for their experiments. There may be constraints related to the availability of specific data on refractive indices for various concentrations of glucose.
If you believe this report, it does.blackcat said:is there a site with this? i want to see how the ref. index. of a soln of glucose varies with concentration.
can someone tell me if my prediction that as concentration increase, ref. index increases is correct?
Use speed of light in a vacuum. Even air has an index of refraction that is slightly different than 1. As a pracitical matter, if you measure the index of refraction relative to "air" it will be the same as relative to vacuum to the level of accuracy you are likely to achieve. Unless you need fantastic precision, you can assume light travels the same speed in air as in a vacuum.blackcat said:Thanks a lot again.
One more question: you know with my value of refractie index i worked out. if i want to measure the speed of light in the medium, i know the equation is refractive index = (speed of light / speed of light in liquid) and I know you can rearrange that.
but for the "speed of light", do i use the speed of light in air? or vacuum? bearing in mind my experiment (lens),