spectroscope
/ˈspɛktrəskoʊp/
noun
- An instrument that separates light into its component colors (spectrum) for observation or analysis, often used to study the properties of light sources.
- The astronomer looked through a spectroscope to examine the light from distant stars.
- A simple spectroscope can be made with a prism and a cardboard tube.
- Using a spectroscope, the students saw the rainbow lines of hydrogen gas.