Explain with the help of a diagram, how we are able to observe the sunrise about two minutes before the sun gets above the horizon.
CBSE OUTSIDE DELHI - SET 1 2011
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Sunrise can be observed two minutes before the sun actually gets above the horizon because of the phenomenon of bending of light as a result of atmospheric refraction. The rays coming from the sun get refracted because of the difference in the density of the atmospheric layers and then reach the observer. Thus, the light coming is perceived as coming from the sun and hence, the sunrise is seen two minutes before it actually rises.
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