Abstract: When we look at objects giving off light (or reflecting light) we find three types of spectra. They are produced in different ways, and can actually tell us about the physical properties of the materials producing the spectra. These spectra are known as “a continuous spectrum” (or continuum emission), “an emission line spectrum” and “an absorption line spectrum”. Here, in this project we have tried to analyze all these spectra obtained from common light sources and KMnO4. All the spectra were obtained with the help of a diffraction grating & spectrometer.