Singh, Shyam2018-01-222018-01-222017Singh, S. (2017). Diffraction grating and a plano convex lens refractometer. International Science & Technology Journal of Namibia, 9, 107-111.http://hdl.handle.net/11070/2140This paper describes a method of finding the refractive index of liquids using a thin plano-convex lens and a transmission diffraction grating. Light from a low power helium- neon laser is diffracted by a transmission diffraction grating and the diffracted light is received by the thin plano-convex lens L and focuses it at the image distance v. A formula is derived to calculate the refractive index of experimental liquid at a particular temperature.enRefractive indexDiffraction grantingArticle