What is atmospheric refraction ? Explain with the help of a labelled
diagram that the position of a star as seen by us is not its true position.
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Atmospheric refraction can be defined as the phenomenon in which light deviates from its straight line path due to refraction at various air density levels as the height varies. The position of the star seen by us is not its true position because of the phenomenon mentioned above.
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No, it is not true position. It is apparent position we see because we know there are many layers in atmosphere, therefore light coming from stars undergo refraction many times which occurs in medium of gradually changing refractive index and therefore we see the apparent position of the star.
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