Kariyappa, R; Jayarajan, A. P; Raheem, K. C. A; Sivaraman, K. R
(Astronomical Society of India, 1993-06)
We have described the double-pass spectrograph built at the Indian Institute of Astrophysics. Measurements of the scattered light within the spectrograph using the photoelectric scans of the NaI D-lines show that this is ...