(a) (10 marks) Draw a schematic of a slit spectrograph for an astronomical tele-
scope, and label 5 key parts of the spectrograph. You may choose a spectrograph
that uses either diraction or refraction to disperse light from a celestial source.
(b) (3 marks) To produce a spectrum of a celestial object with a telescope, why
can’t you just put a dispersing element (such as a prism) at the telescope’s focal
(c) (3 marks) You can produce low resolution spectra of a star by placing a frying
pan splatter guard (with a wire grid) in front of a telescope. Why does this work,
when placing a dispersing element at the telescope focal plane does not?
(d) (7 marks) The diraction grating equation for light normally incident on the
grating is a sin(m) = m. If the frying pan splatter guard wire mesh has a
spacing of 1 mm and we are observing at wavelengths of 0:6 m, how far are
the spectra from the image of the star? (Give your answer in units of arcseconds.)
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