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The figure below is for a Bunsen prism monochromator, which can be used to select a...

The figure below is for a Bunsen prism monochromator, which can be used to select a desired wavelength for chemical analysis from polychromatic light. (a) What property or mechanism allows the prism to separate polychromatic light into beams of monochromatic light? (b) Which wavelength (l1 or l2) in the figure is the longer wavelength? Explain.

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