Explain the different cases of refraction with the help of suitable di

1.	Explain the different cases of refraction with the help of suitable diagram
Answer» Atmospheric refraction is the phenomenon of bending of light on passing through the Earth’s atmosphere. The reason for this occurrence is that the upper layers of the Earth’s atmosphere are rarer compared to the lower layers. On account of atmospheric refraction of light,\xa0\tThe stars seem higher than they actually are.\tThe Sun appears to rise 2 minutes before and set 2 minutes later, increasing the apparent length of the day by 4 minutes.\tThe Sun appears oval at sunrise and sunset, but appears circular at noon.\tThe stars twinkle and planets do not.

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