It seems there may be a misunderstanding or confusion in your question. The experiments you mentioned, examining the inertia of the pendulum and deriving the speed of light in a medium, are actually associated with physicist Léon Foucault, not the philosopher Michel Foucault.
However, since you asked about the personality of Michel Foucault, I can provide some information on that. Michel Foucault (1926-1984) was a French philosopher, social theorist, and historian of ideas. He is known for his influential works on power, knowledge, discourse, and the relationship between these concepts and institutions such as prisons, hospitals, and sexuality.
When it comes to Foucault’s personality, he was described by those who knew him as an intense and passionate thinker. He was known to be highly intelligent, rigorous in his research, and deeply committed to his ideas. Foucault had a reputation for being intellectually daring and challenging conventional wisdom.
Foucault was also known for his engagement in political activism and his involvement in various social movements, particularly those related to LGBTQ+ rights and prison reform. He was openly gay at a time when it was not widely accepted, and his personal experiences influenced his intellectual work.
Overall, Foucault’s personality could be characterized as intellectually driven, passionate, and politically engaged. His ideas and writings continue to have a significant impact on various fields of study, including philosophy, sociology, and cultural theory.」