Can anyone here at UG tell me what kind of glass a camera lens is made of?
I need to describe the making process of camera lenses, and I've been looking everywhere, but I can't find what kind of glass it is...

Can you please help me?
Crit please! ===>> Agony
thank you so much... that video made my day... ;D
now i can finish my work!
Crit please! ===>> Agony