School - what does spectroscope mean?

A spectroscope is a scientific instrument that splits light into its different wavelengths, which humans see as different colors. Violet has the shortest wavelength that people can see and red the longest. This instrument can also identify wavelengths that humans cannot see, such as infrared and ultraviolet radiation. Light usually contains a mixture of different wavelengths; by studying these, scientists can find out useful information, such as the chemical elements present at the source of the light. Spectroscopes are widely used in astronomy, chemistry, and other areas.
Y do u need to know wat it means??
Just wondering, anyway hope i helped :)