Key Questions 17. Based on the schematic shown in Figure 4, what is the func cti

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Key Questions 17. Based on the schematic shown in Figure 4, what is the func ction of the following components in the monochromator? a. Diffraction grating b. Mirrors c. Exit slit 18. Compare the diagrams in parts A and B in Figure 4. How are they different? 19. How do the components change in order to select a wavelength to exit the monochromator? Originally monochromators utblized prisms to separate the source's wavelengths. Modern monochromators use dffraction gratings as the dispersive element. Gratings separate the wavelengths of light through constructive interterence, and as a result, different waveilengths tocus at different places along the focal plane. This process is called diffraction

Explanation / Answer

17)

a. Diffraction grating: A diffraction grating is an optical component of monochromator, which has a periodic structure and splits and diffracts light into several beams travelling in different direction.

Diffraction grating are dispersive elements. The diffraction grating uses the difference in diffraction direction for each wavelength due to interference.

b. Mirrors: Mirrors are collimating element, which make the rays parallel when it pass though one point of the entrance slit.

c. Exit slit: It is component of monochromator, through which selected color can exit. By rotating diffraction grating, different wavelength can be made to pass through exit slit

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