Volume : III, Issue : IX, September - 2014

A Study of Effect of Distance Between Collimator and Grating on Angle of Deviation

Kavita R Kolte

Abstract :

The resolving power of diffraction grating is much higher as compared to a prism and hence when there is a need to separate light of different wavelengths with high resolution, diffraction grating is the most often used tool of choice. It consists of a polished surface of usually, glass or metal, having a large number of very fine closely spaced parallel lines or grooves. In order to obtain the spectrum of white light using grating, the grating is mounted perpendicularly and placed at the centre of the prism table of spectrometer. This study was undertaken to answer the inquisitiveness of my students about why the grating should be placed only at the centre and what would happen to the angle of deviation if the grating is placed at other points on the prism table. The spectrometer was adjusted for parallel rays using Schuster’s method and the slit was illuminated using Mercury source. The grating was mounted perpendicularly using the standard procedure and readings of first order were noted for different colours by placing the grating at different distances from the collimator slit. The angle between red and violet colours was obtained to find the angular separation between them. The results show that there is almost no difference in the angular separation and hence the deviation angle is independent of the distance at which the grating is placed from the collimator. 

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Kavita R Kolte, A Study of Effect of Distance Between Collimator and Grating on Angle of Deviation, International Journal of Scientific Research, Vol : 3, Issue : 9 September- 2014

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