During an early phase of the planet's existence, earth's atmosphere was similar in composition to the atmospheres of mars and venus. at that time earth's principal atmospheric gas was

Difference between series and parallel circuits

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.

What is part of a line has one endpoint and continues in one direction?