Spectrometer - Goniometer 2

Holmarc’s Spectrometer Goniometer is designed as a versatile instrument suitable for precise determination of the optical parameters of prisms and gratings. It can also be used as a spectroscope, for qualitative examination and measurement of emission and absorption spectra. Holmarc’s well designed mechanics of the Goniometer allows maintenance-free operation over many years.

This system consists of a mercury lamp with power supply, prism with holder and transmission grating with holder. The collimator and the telescope have a focal length of 202 mm and a diameter of 32 mm. The collimator tube has an adjustable slit.

Experiment

•     Determine the refractive index of a glass prism
•     Demonstrate the relationship between refractive index and wavelength (dispersion curve)
•     Calculate the resolving power of the glass prism from the slope of the dispersion curves
•     Determine the wavelengths of the mercury spectral lines
•     Determine the grating constant of a diffraction grating based on the diffraction angle of the high intensity spectral lines of mercury
•     Determine the angular dispersion of a grating
•     Calculate the resolving power required to separate the different Hg-Lines

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