NCERT Exercise 1.16 - Units and Measurement
Question: Explain this common observation clearly: If you look out of the window of a fast moving train, nearby trees and houses seem to move rapidly in a direction opposite to the train's motion, but distant objects such as hill tops, the Moon and the stars seem to be stationary. In fact, since you are aware that you are moving, these distant objects seem to move with you.
Answer: The observation is caused by **motion parallax**: apparent angular motion varies inversely with distance, so nearby objects appear to move rapidly backward while extremely distant objects show negl...
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