rehend the refraction of LIGHT through a glass section consider the FIGURE given underneath which shows the refraction of light through a rectangulaHere in this figure AO is the light beam going in air and occurrence on glass piece at point O.   Presently on entering the glass MEDIUM this beam twists towards the ordinary NN' that is light beam AO GETS refracted on entering the glass medium.   In the wake of getting refracted this beam currently goes through the glass piece and at call attention to it leaves the glass section as appeared in the figure.   Since beam OB goes from glass medium to air it again gets refracted and twists from typical N1N'1 and goes in course BC.   Here AO is the occurrence beam and BC is the rising beam and the two of them are parallel to one another and OB is the refracted beam.   Rising beam is parallel to occurrence beam on the grounds that the degree of twisting of the beam of light at the contrary parallel faces which are PQ (air-glass interface) and SR (glass-air interface) of the rectangular glass chunk is equivalent and inverse.   In the figure I is the edge of rate, r is the point of refraction and e is the edge of rise.   Edge of rate and point of rise are equivalent as rising beam and occurrence beam are parallel to one another.   At the point when a light beam is episode ordinarily to the interface of two media then there is no twisting of light beam and it goes straight through the medium.r glass sectionExplanation: