Hartmann's formula using constant deviation spectrograph

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Theory: Cauchy's equation is an empirical relationship between the refractive index and wavelength of light for a particular transparent material. Hartmann'sTo measure the wavelength of absorption bands of KMnO4 and calculate it's Hartmann's constant. (b) Study of emission spectra of metals using constant deviation spectrometer When it is used to photograph the spectrum it is called spectrograph. Aim: To verify the Hartmann Dispersion Formula and to determine the dissociation energy of I2 molecule using a constant deviation spectrometer. Apparatus. Introduction: An instrument used to study the spectra with unaided eye is called spectroscope or spectrometer. When it is used to photograph, the spectrum Manufacturer of Constant Deviation Spectrograph – He-Ne Laser, Diode Laser, Nuclear Physics Instrument offered by Manju Scientific, Delhi. Here, the different wavelengths of light are refracted and can be viewed through the second arm (the telescope). The collimator houses an adjustable slit, able Therefore, to measure wavelengths using a prism, a calibration graph of the angle of deviation versus wavelength must be constructed using a light source with a The experiment is repeated by rotating the analyzer through 10o degree To verify Hartmann's dispersion formula using a constant deviation spectrometer.