Light is incident on a piece of glass in air at an angle of 33 degrees from the normal. if the index of refraction of the glass is 1.5, what is the angle in degrees that the refracted ray makes with the normal?

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.