TitleMeasuring wavelengths using a diffraction gratings.ObjectiveTo determine the wavelength of a light source using a diffraction gratings.Apparatus-Laser source-Diffraction gratings-Optical bench-Screen-Meter ruler-Retort standsProcedure1.A laser source was placed at one end of the optical bench and a screen S was placed ata distance of 30cm from the laser source. The laser was switched on. A bright dot due tothe laser beam on the screen was observed.2.The diffraction grating was placed 10cm from the laser source so that the laser beamdiffracted through the grating. The grating was ensured parallel to the screen. Thenumber of liners per mm was noted as stated on the grating card.
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3.The normal distance was measured from the grating to the screen. The value wasrecorded.4.The series of bright dots on the screen was observed. The central dot, which passesthrough the grating un-deflected, is called the zero order images. Symmetrical each sideof this central spot is the 1st, 2nd, 3rdetc. order images.
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