Abstract
Although the observation of optical spectra is common practice in physics
classes, students are usually limited to a passive, qualitative observation of
nice colours. This article discusses a diffraction-based spectrometer that
allows students to take quantitative measurements of spectral bands. Students
can build it within minutes from generic low-cost materials. The spectrometer's
simple, didactic design allows students to fully comprehend the underlying
physical concepts and to engage in a discussion on measurement errors and
uncertainties.
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