Pharmacy Study Material

Free pharmacy material Refractometry INTRODUCTION Refractometry is the method of measuring the refractive index of substances. Refractive index is defined as the ratio of the speed of light in a vacuum to the speed of light in another substance is defined as the index of refraction or refractive index (n) for the substance. Refraction phenomenon PRINCIPLE AND THEORY The main principle involved in refractometry is the refraction based on the speed of the light that passes in the different mediums. Light enters into the light denser medium to high denser medium at an angle, that is, with bent. The bent in the light ray is known as the refraction. The relation between the refraction of the light between the air and the medium is given by Snell's law: n = sin i /sin r where n = refractive index; sin i = angle of incidence; sin r = angle of refraction. Samples with different refractive index will produce different angles of refraction. This helps...