What will be yhe critical angle if light is incident from glass(n=1.5) in to air (n=1)​

Centrapedial force is the answer

Ithink the answer would be a 

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;