गोलीय दर्पण में वक्रता (R) त्रिज्या और फोकस दूरी (f) में संबंध | f= R/2 🔎 prove that f=R/2

गोलीय दर्पण में वक्रता (R) त्रिज्या और फोकस दूरी (f) में संबंध | f= R/2 🔎 prove that f=R/2 #video || #ncert #expression

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