Observation with a Spectroscope. A spectroscope or spectrometer splits light into the wavelengths that make it up. Early spectroscopes like the one in this illustration used prisms that split the light by refraction — bending the light waves as they passed through the glass.

- Image ID: HWRECP
Observation with a Spectroscope. A spectroscope or spectrometer splits light into the wavelengths that make it up. Early spectroscopes like the one in this illustration used prisms that split the light by refraction — bending the light waves as they passed through the glass.
Lebrecht Music & Arts / Alamy Stock Photo
Image ID: HWRECP