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The Brainliest Answer!
2015-02-28T19:09:26+05:30
IF THE RAYS MOVE VERY CLOSE TO PRINCIPAL AXIS,THE RAYS CAN BE TREATED AS PARALLEL AND ARE CALLED PARAXIAL RAYS.
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ITS OK. BUT I DONOT KNOW THE DIAGRAM FOR IT
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2015-02-28T19:21:44+05:30
The rays which are very close to the principal axis is called paraxial rays 
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