Video narration
Rassi ki lahar aage badhte samay upar-neeche hil sakti hai - to prakash ki lahar mein kampan kis disha mein hote hain? Rassi ko aage ki or lahar bhejte hue upar-neeche hilaiye. Lahar aage badhti hai, lekin rassi ka hilna gati ki disha se alag hai. Yah keval samajhne ka udaharan hai. Prakash mein vidyut kshetra bhi aage badhne ki disha ke lambavat kampan karta hai. Samanya prakash mein ye kampan kai dishaon mein hote hain. Ab prakash paaradarshi dhruvak se guzarta hai. Dhruvak keval ek disha ke kampan ko aage jaane deta hai; baaki ruk jaate hain. Baahar nikalne wala prakash dhruvit prakash kehlata hai. Yaani samanya prakash mein kai dishaon ke kampan hote hain, jabki dhruvit prakash mein ek disha bachti hai. Ab asli nishkarsh: kampan aur prakash ki gati ki dishaen alag hain. Dhruvan siddh karta hai ki prakash ek anupraasth tarang hai.