What equation is this Indian astrophysicist who founded Indian Physical Society best known for?
Indian Physical Society:  It was formally established in 1934 by pioneering Indian physicist Meghnad Saha. Meghnad Saha: Meghnad Saha FRS (6 October 1893 – 16 February 1956) was an Indian astrophysicist best known for his development of the Saha ionization equation, used to describe chemical and physical conditions in stars.
Saha ionization equation