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204. The following statements about the operation of the Abbe refractometer are true except:A. Abbe refractometer - determines the refractive index of a substance, the basic principle of the measurement being the phenomenon of light refractionB. If the separation surface between the two media (glass and liquid to be studied) is exposed to a divergent beam of rays, only the rays whose angle of incidence is smaller than the limiting angle will penetrate the liquidC. rays whose angle of incidence is smaller than the limit angle determined by the refractive index of the liquid will generate a light field, while the other rays are totally reflected returning to the glass and will generate a dark field in the eyepiece of the Abbe refractometerD. By determining the limiting angle, the refractive index is determined, the device being calibrated in such a way as to allow direct reading of the index in one of the instrumen
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