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Due to total internal reflection
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Sunlight is made up of seven diff, colours named VIBGYOR with increasing wavelength during sunrise and sunset sun is at horizon and apparently at large distance from observer hence sunlight has to travel long path to reach the observer while travelling the path other colour having less wavelength get diffracted and the light reaching the observer is mainly in orange and red hence sun appears reddish at the time of sunrise and sunset
mark it as brainliest plz
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