What is the maximum angle between a light ray and the wall of the core if the ray is to remain inside the core?.

It would be choice c as the correct answer choice.

It’s b each orbits at a slower rate than the rate rate which the moon orbits the earth

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.