If a meterstick is tilted at an angle of 45 degrees in its own frame, how is it perceived by an observer?

When a meterstick is tilted at an angle of 45 degrees in its own frame, it means that the orientation of the stick relative to its own length is precisely at that angle. An observer, viewing the meterstick at that tilt, will perceive it as having the same angle with respect to the horizontal. This is due to the way angles are defined; they are measured relative to a surface or a particular frame of reference.

In this scenario, the angle remains unchanged regardless of the observer's position or the stick's orientation, as long as we are considering it within the context of its own frame. Therefore, the observer perceives the meterstick as being tilted at exactly 45 degrees. This phenomenon reaffirms the consistency of angular measurement in physics when considering objects within their own reference frames.