1.phase difference and path difference. https://youtu.be/8nSVWGJC0Bk. 2.Whatsup group: https://chat.whatsapp.com/JwrnnET3JWDLCtlfZDHWgU 3. Facebook group https://www.facebook.com/celestin.physics 4.Telegram group https://t.me/mrskyphysics Contact me 7811987021. #sky physics#
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