Rydberg constant, denoted is a fundamental physical constant that characterizes the atomic spectra of hydrogen. It is crucial for understanding atomic physics, particularly in the context of quantum mechanics and spectroscopy. To measure the Rydberg constant experimentally, a detailed setup is required that involves precise measurements of light emitted by hydrogen atoms, typically in a hydrogen discharge tube. Below is a complete guide to the setup and process for measuring the Rydberg constant. Set up a diffraction grating or optical prism in the path of the light emitted from the discharge tube.  This will disperse the light and produce a spectrum. Use an optical spectrometer to measure the wavelength of the emitted spectral lines from the hydrogen discharge.  These lines correspond to transitions between the energy levels of the hydrogen atom.