Question

In the study of the atomic spectral lines we are using spectrometers. There are two main group of spectrometers. One is with prisms and the other with optical gratings. Which one is better and which one you would choose in the laboratory? Draw the dispersion curve of the prism and of the grating

Answer 1

if this answer is wrong , i will delete

ans) grating is better than prism

: Prisms can spread light spectra into many colors for analysis. This is often good enough. A diffraction grating does very much the same thing. However, a diffraction grating is less sensitive to the color of the light and can be made to spread colors over a larger angle than a prism.

The glass in a prism is clear to visible light, but it absorbs and blocks light in the infrared and ultraviolet part of the spectrum. Chemical analysis often depends on identifying particular colors from the spectrum of the sample which are beyond the visible range.