# lab report phy260 exp6.docx - Title Measuring wavelengths...

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Title Measuring wavelengths using a diffraction gratings. Objective To determine the wavelength of a light source using a diffraction gratings. Apparatus - Laser source - Diffraction gratings - Optical bench - Screen - Meter ruler - Retort stands Procedure 1. A laser source was placed at one end of the optical bench and a screen S was placed at a distance of 30cm from the laser source. The laser was switched on. A bright dot due to the laser beam on the screen was observed. 2. The diffraction grating was placed 10cm from the laser source so that the laser beam diffracted through the grating. The grating was ensured parallel to the screen. The number 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 was recorded. 4. The series of bright dots on the screen was observed. The central dot, which passes through the grating un-deflected, is called the zero order images. Symmetrical each side of this central spot is the 1 st , 2 nd , 3 rd etc. order images.
• Fall '19

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