To make a spectrum of the Sun similar to a textbook solar spectrum (continuous rainbow with dark absorption lines) but with less detail, you would: Use a very narrow slit to isolate a thin beam of sunlight, then pass that beam through a glass prism (or diffraction grating), and observe the spread-out colors on a screen or through an eyepiece.

What this setup needs

  • A slit : This turns the incoming sunlight into a narrow, well-defined beam so the spectrum is sharp rather than blurry.
  • A dispersing element (prism or grating): This spreads the white sunlight into its component wavelengths (colors), creating the spectrum.
  • A screen or eyepiece : This lets you view or photograph the resulting spectrum.

In many homework or exam questions, the correct procedure is described exactly as:

“Pass sunlight through a narrow slit, then through a prism, and observe the spectrum on a screen (or with an eyepiece).”

This will give you a solar spectrum similar in overall appearance to a professional one, but with fewer visible lines and less fine detail because your equipment is much simpler than a research spectrograph.

Information gathered from public forums or data available on the internet and portrayed here.