phasedifference and pathdifference good videos

 

https://www.youtube.com/watch?v=REy7hoozFRQ
phase difference and path difference

https://www.youtube.com/watch?v=j1ULNWZ3Xh4
Path Difference and Phase difference

https://www.youtube.com/watch?v=MT-h_UFX5WA
Path Difference and Conditions for Constructive Interference and Destructive Interference

https://www.youtube.com/watch?v=ToBL_xNS02w

https://www.youtube.com/watch?v=REy7hoozFRQ
Phase and Phase difference between two waves Urdu/Hindi

https://www.youtube.com/watch?v=PUma5kAH_AA

Phase Lag/Lead Explained Urdu/Hindi
https://www.youtube.com/watch?v=sFuMOB2hBRg