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A spectrohelioscope is a telescope designed to show the Sun in a particular wavelenght of light. The name comes form three latin-based words: Spectro, referring to the optical spectrum, Helio, referring to the Sun and Scope, as in telescope. The basic spectrohelioscope is a complex machine that uses a spectroscope to scan the surface of the sun. The image from the objective lens is focused on a narrow slit revealing only a thin porton of the suns surface. The light is then passed through a prism or diffraction grating to spread the light into a spectum. The spectrum is then focused on another slit that allows only a narrow part of the specturm (the desired wavelength of light for wiewing) to pass. The light is finally focused on a eyepiece so the surface of the Sun can be seen. The view, however, would be only a narrow strip of the Sun's surface. The slits are moved in unison to scan across the whole surface of the sun giving a full image.
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