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Experiment Title Spectrometer Grating

Experiment Title Spectrometer Grating School of Sciences Department of Physics Uttarakhand Open University, Haldwani Dr. Meenakshi Rana Plan of the talk diffraction Types of diffraction Grating diffraction through Grating Experiment (Aim, Apparatus required, Formula used) Least count of Spectrometer Procedure to perform Experiment Precautions and sources of error References Fraunhofer diffraction In this type source of light and screen are at infinite distance from the obstacle. Joseph von Fraunhofer 1787-1826 Fresnel diffraction In this type source of light and screen are at finite distance from the obstacle. Augustin Fresnel Simple trick to remember Fraunhofer Fresnel 1 Source and screen are at infinite distance from slit Source and screen are at finite distance from slit 2 Incident wavefront on the aperture is plane Incident wavefront on the aperture is either spherical or cylindrical 3 The diffracted wavefront is plane The diffracted wavefront is either spherical or cylindrical 4 Two biconvex lenses are required to study diffractio

experiments, initially with items such as bird feathers. ... Diffraction gratings are based on diffraction while prisms are based on dispersion, two very different principles. Prisms can spread light spectra into many colors for analysis. This is often good enough. A diffraction grating does very much the same thing.

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