This document summarizes a lab seminar on the dispersive power of a prism. It introduces the key components of a spectrometer used to study light dispersion through a prism. The procedure involves measuring the angle of the prism, finding the minimum deviation angle using a sodium lamp, and using these values in formulas to calculate the refractive index and dispersive power. Precautions are outlined to properly conduct the experiment and reduce errors. The results section would present the calculated dispersive power of the prism based on the experimental values obtained.