To view a spectrum, the light slit must be aligned with the light source.
Hold the spectroscope about five inches from the light source. While looking through the eyepiece, align the slit of the spectroscope with the source. The slit is well aligned when the displayed spectrum is brightest and the left edge of the spectroscope is approximately perpendicular to the source.
When the slit is properly aligned, examine the spectrum through the spectroscope.
When recording several spectra, take all measurements at approximately
the same angle and distance from each light source.
