Correct Answer: Spectroheliograph

Solution : The correct option is a Spectroheliograph .

The spectroheliograph is an astronomical apparatus that takes a monochromatic photo of the Sun at a single wavelength of light. Typically, the wavelength is selected to match the spectral wavelength of a chemical element in the Sun. The quantity of photons (the intensity of light) absorbed after passing through a sample solution is measured by a spectrophotometer.