Prisms Lamp

What is the wavelength of cyan light in the mercury spectrum?
I need help with a lab in my college course. We placed a prism on the table of a spectrometer, then shone light from a mercury spectral lamp through the slit in the collimator. We then had to find the refractive index of the prism by determining the angles needed to focus on different coloured-lines. We were given a table with the known wavelengths of light in the spectrum; which wavelengths gave faint/strong images etc.
However we were not told the wavelength of cyan light. We have to determine it from reading a graph of refractive index vs wavelength. Roughly, what should its wavelength be? Also, should the graph be a straight line graph or one with a curve?
pure cyan light at 485 nm
Prolight & Sound 2011: Showtec Phantom 300 Spot
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