Discussion
Which of the following is the correct sequence of the components of a monochromator in Emission Spectrometry ?
Answer: B
The correct sequence is entrance slit, collimating lens, prism, focusing lens, exit slit.
Light enters a monochromator through the entrance slit. A collimating lens (or mirror) makes the rays parallel, the prism (or grating) disperses them into their wavelengths, the focusing lens forms an image of the slit for each wavelength, and the exit slit lets through only a narrow band of wavelengths.
Placing the focusing lens before collimation, or the prism before the collimating lens, would disperse non-parallel light, and the third option runs the light path backwards.
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